Hi, I hope someone can help us, we really need help with our mailserver. It looks like someone has managed to get in and use our mail server to send out SPAM. We are a school with apprx. 30 email users. We have been using the ISP's smtp-port. Now they have blocked the smtp port from our school, since a lot of spam was sent out. This means that we can not send mail outside. We have checked everything inside, also turned off everything, all computers, servers the wireless network, just left the mail and webserver on. And through the logs it looks like someone is still trying to send spam. We want to change our smtp so we use our own, not through the ISP's port, so they don’t block us anymore. And the other thing is that we have not used authentication for our mails. Please help us!!!!! We don’t have much experience in this, the mailserver with Suse and Postfix was set up by someone else 4 years ago. We have SUSE LINUX 10.0 (X86-64) OSS (VERSION = 10.0), postfix = 2.2.5, and ISPConfig Version: 2.2.18. Here is a sample of /var/log: Code: /var/log # tail -f warn Feb 10 17:25:31 kmail postfix/smtpd[3324]: warning: 94.97.209.201: hostname 94.96.209.201.dynamic.saudi.net.sa verific ation failed: Name or service not known Feb 10 17:25:32 kmail postfix/smtpd[3324]: warning: support for restriction "check_relay_domains" will be removed from Postfix; use "reject_unauth_destination" instead Feb 10 17:26:51 kmail postfix/smtpd[3324]: warning: 187.65.33.71: hostname bb412147.virtua.com.br verification failed: Name or service not known Code: /var/log # tail -f mail Feb 10 17:12:24 kmail postfix/qmgr[2160]: 1B24818171: to=<[email protected]>, relay=none, delay=1832, status=deferred (delivery temporarily suspended: Host or domain name not found. Name service error for name=localhost type=AAAA: Host not found) Feb 10 17:12:24 kmail postfix/qmgr[2160]: 17C8A1817C: to=<[email protected]>, relay=none, delay=1822, status=deferred (delivery temporarily suspended: Host or domain name not found. Name service error for name=localhost type=AAAA: Host not found) Feb 10 17:12:24 kmail postfix/qmgr[2160]: 188031817F: to=<[email protected]>, relay=none, delay=1818, status=deferred (delivery temporarily suspended: Host or domain name not found. Name service error for name=localhost type=AAAA: Host not found) Feb 10 17:12:30 kmail postfix/smtpd[2722]: warning: 187.40.200.39: hostname 18740200039.user.veloxzone.com.br verification failed: Name or service not known Feb 10 17:12:30 kmail postfix/smtpd[2722]: connect from unknown[187.40.200.39] Feb 10 17:12:31 kmail postfix/smtpd[2722]: setting up TLS connection from unknown[187.40.200.39] Feb 10 17:12:31 kmail postfix/smtpd[2722]: TLS connection established from unknown[187.40.200.39]: TLSv1 with cipher RC4-MD5 (128/128 bits) Feb 10 17:12:32 kmail postfix/smtpd[2722]: warning: support for restriction "check_relay_domains" will be removed from Postfix; use "reject_unauth_destination" instead Best regards, Mazgit
Most spam is send trough vulnerable cms systems or contact forms. 1) Do you host a website on this erver, that is accessible from outside? 2) Have you checked your server with rkhunter and chkrootkit?
This howto might help you find the problem. http://www.howtoforge.com/how-to-log-emails-sent-with-phps-mail-function-to-detect-form-spam
Hi Till, 1) Do you host a website on this erver, that is accessible from outside? No, this is only a mailserver. 2) Have you checked your server with rkhunter and chkrootkit? Have checked now with rkhunter and chkrootkit, but are not so familiar with linux, so I'm not sure about the result. Here is the summary of the rkhunter(there were a lot of warnings): Code: [19:07:48] Checking for string 'libproc.so.2.0.7' [ Not found ] [19:07:48] Checking for string '/dev/ida/.inet' [ Not found ] [19:07:48] Warning: Checking for possible rootkit strings [ Warning ] [19:07:48] Found string 'hdparm' in file '/etc/init.d/boot.idedma'. Possible rootkit: Xzibit Rootkit [19:07:48] [19:07:48] Performing malware checks [19:07:48] Info: Starting test name 'malware' [19:07:48] [19:07:48] Info: Test 'deleted_files' disabled at users request. [19:07:48] Info: Starting test name 'running_procs' [19:07:48] Checking running processes for suspicious files [ None found ] [19:07:48] [19:07:48] Info: Test 'hidden_procs' disabled at users request. [19:07:48] [19:07:48] Info: Test 'suspscan' disabled at users request. [19:07:48] [19:07:48] Performing check for login backdoors [19:07:49] Info: Starting test name 'other_malware' [19:07:49] Checking for '/bin/.login' [ Not found ] [19:07:49] Checking for '/sbin/.login' [ Not found ] [19:07:49] Checking for login backdoors [ None found ] [19:07:49] [19:07:49] Performing check for suspicious directories [19:07:49] Checking for directory '/usr/X11R6/bin/.,/copy' [ Not found ] [19:07:49] Checking for directory '/dev/rd/cdb' [ Not found ] [19:07:49] Checking for suspicious directories [ None found ] [19:07:49] [19:07:49] Checking for software intrusions [ Skipped ] [19:07:49] Info: Check skipped - tripwire not installed [19:07:49] [19:07:49] Performing check for sniffer log files [19:07:49] Checking for file '/usr/lib/libice.log' [ Not found ] [19:07:49] Checking for file '/dev/prom/sn.l' [ Not found ] [19:07:49] Checking for file '/dev/fd/.88/zxsniff.log' [ Not found ] [19:07:49] Checking for sniffer log files [ None found ] [19:07:49] [19:07:49] Performing trojan specific checks [19:07:49] Info: Starting test name 'trojans' [19:07:49] Checking for enabled inetd services [ Skipped ] [19:07:49] Info: Check skipped - file '/etc/inetd.conf' does not exist. [19:07:49] [19:07:49] Performing check for enabled xinetd services [19:07:49] Info: Using xinetd configuration file '/etc/xinetd.conf' [19:07:49] Checking '/etc/xinetd.conf' for enabled services [ None found ] [19:07:49] Found 'includedir /etc/xinetd.d' directive [19:07:49] Checking '/etc/xinetd.d/chargen' for enabled services [ None found ] [19:07:49] Checking '/etc/xinetd.d/chargen-udp' for enabled services [ None found ] [19:07:49] Checking '/etc/xinetd.d/daytime' for enabled services [ None found ] [19:07:50] Checking '/etc/xinetd.d/daytime-udp' for enabled services [ None found ] [19:07:50] Checking '/etc/xinetd.d/echo' for enabled services [ None found ] [19:07:50] Checking '/etc/xinetd.d/echo-udp' for enabled services [ None found ] [19:07:50] Checking '/etc/xinetd.d/fam' for enabled services [ None found ] [19:07:50] Checking '/etc/xinetd.d/netstat' for enabled services [ None found ] [19:07:50] Checking '/etc/xinetd.d/omni' for enabled services [ Warning ] [19:07:50] Checking '/etc/xinetd.d/servers' for enabled services [ None found ] [19:07:50] Checking '/etc/xinetd.d/services' for enabled services [ None found ] [19:07:50] Checking '/etc/xinetd.d/systat' for enabled services [ None found ] [19:07:50] Checking '/etc/xinetd.d/time' for enabled services [ None found ] [19:07:50] Checking '/etc/xinetd.d/time-udp' for enabled services [ None found ] [19:07:50] Checking for enabled xinetd services [ Warning ] [19:07:50] Warning: Found enabled xinetd service: /etc/xinetd.d/omni [19:07:50] Info: Apache backdoor check skipped: Apache modules and configuration directories not found. [19:07:50] [19:07:50] Performing Linux specific checks [19:07:50] Info: Starting test name 'os_specific' [19:07:50] Checking loaded kernel modules [ OK ] [19:07:50] Info: Using modules pathname of '/lib/modules/2.6.13-15.18-default' [19:07:50] Checking kernel module names [ OK ] [19:07:57] [19:07:57] Checking the network... [19:07:57] Info: Starting test name 'network' [19:07:57] Info: Starting test name 'ports' [19:07:57] [19:07:57] Performing check for backdoor ports [19:07:57] Checking for TCP port 1524 [ Not found ] [19:07:57] Checking for TCP port 1984 [ Not found ] [19:07:58] Checking for UDP port 2001 [ Not found ] [19:07:58] Checking for TCP port 2006 [ Not found ] [19:07:58] Checking for TCP port 2128 [ Not found ] [19:07:58] Checking for TCP port 6666 [ Not found ] [19:07:58] Checking for TCP port 6667 [ Not found ] [19:07:58] Checking for TCP port 6668 [ Not found ] [19:07:58] Checking for TCP port 6669 [ Not found ] [19:07:58] Checking for TCP port 7000 [ Not found ] [19:07:58] Checking for TCP port 13000 [ Not found ] [19:07:58] Checking for TCP port 14856 [ Not found ] [19:07:58] Checking for TCP port 25000 [ Not found ] [19:07:59] Checking for TCP port 29812 [ Not found ] [19:07:59] Checking for TCP port 31337 [ Not found ] [19:07:59] Checking for TCP port 33369 [ Not found ] [19:07:59] Checking for TCP port 47107 [ Not found ] [19:07:59] Checking for TCP port 47018 [ Not found ] [19:07:59] Checking for TCP port 60922 [ Not found ] [19:07:59] Checking for TCP port 62883 [ Not found ] [19:07:59] Checking for TCP port 65535 [ Not found ] [19:07:59] [19:07:59] Performing checks on the network interfaces [19:07:59] Info: Starting test name 'promisc' [19:07:59] Checking for promiscuous interfaces [ None found ] [19:07:59] [19:07:59] Info: Test 'packet_cap_apps' disabled at users request. [19:08:05] [19:08:05] Checking the local host... [19:08:05] Info: Starting test name 'local_host' [19:08:05] [19:08:05] Performing system boot checks [19:08:05] Info: Starting test name 'startup_files' [19:08:05] Checking for local host name [ Found ] [19:08:05] Info: Starting test name 'startup_malware' [19:08:05] Checking for system startup files [ Found ] [19:08:08] Checking system startup files for malware [ None found ] [19:08:08] [19:08:08] Performing group and account checks [19:08:08] Info: Starting test name 'group_accounts' [19:08:08] Checking for passwd file [ Found ] [19:08:08] Info: Found password file: /etc/passwd [19:08:08] Checking for root equivalent (UID 0) accounts [ None found ] [19:08:08] Info: Found shadow file: /etc/shadow [19:08:08] Checking for passwordless accounts [ None found ] [19:08:08] Info: Starting test name 'passwd_changes' [19:08:08] Checking for passwd file changes [ None found ] [19:08:08] Info: Starting test name 'group_changes' [19:08:08] Checking for group file changes [ None found ] [19:08:08] Checking root account shell history files [ OK ] [19:08:08] [19:08:08] Performing system configuration file checks [19:08:08] Info: Starting test name 'system_configs' [19:08:08] Checking for SSH configuration file [ Found ] [19:08:08] Info: Found SSH configuration file: /etc/ssh/sshd_config [19:08:08] Info: Rkhunter option ALLOW_SSH_ROOT_USER set to 'no'. [19:08:08] Info: Rkhunter option ALLOW_SSH_PROT_V1 set to '0'. [19:08:08] Checking if SSH root access is allowed [ Not allowed ] [19:08:08] Checking if SSH protocol v1 is allowed [ Warning ] [19:08:08] Warning: The SSH configuration option 'Protocol' has not been set. The default value may be '2,1', to allow the use of protocol version 1. [19:08:09] Checking for running syslog daemon [ Found ] [19:08:09] Checking for syslog configuration file [ Found ] [19:08:09] Info: Found syslog configuration file: /etc/syslog-ng/syslog-ng.conf [19:08:09] Checking if syslog remote logging is allowed [ Not allowed ] [19:08:09] [19:08:09] Performing filesystem checks [19:08:09] Info: Starting test name 'filesystem' [19:08:09] Info: SCAN_MODE_DEV set to 'THOROUGH' [19:08:09] Checking /dev for suspicious file types [ None found ] [19:08:09] Checking for hidden files and directories [ Warning ] [19:08:09] Warning: Hidden directory found: /dev/.udevdb [19:08:20] [19:08:20] Checking application versions... [19:08:20] Info: Starting test name 'apps' [19:08:22] Info: Application 'exim' not found. [19:08:22] Checking version of GnuPG [ Warning ] [19:08:22] Warning: Application 'gpg', version '1.4.2', is out of date, and possibly a security risk. [19:08:22] Checking version of Apache [ Warning ] [19:08:22] Warning: Application 'httpd', version '2.0.54', is out of date, and possibly a security risk. [19:08:22] Checking version of Bind DNS [ Warning ] [19:08:22] Warning: Application 'named', version '9.3.2', is out of date, and possibly a security risk. [19:08:22] Checking version of OpenSSL [ Warning ] [19:08:22] Warning: Application 'openssl', version '0.9.7g', is out of date, and possibly a security risk. [19:08:22] Checking version of PHP [ OK ] [19:08:22] Info: Application 'php' version '4.4.0' found. [19:08:22] Checking version of Procmail MTA [ OK ] [19:08:22] Info: Application 'procmail' version '3.22' found. [19:08:22] Checking version of ProFTPd [ OK ] [19:08:22] Info: Application 'proftpd' version '1.2.10' found. [19:08:22] Checking version of OpenSSH [ Warning ] [19:08:22] Warning: Application 'sshd', version '4.1p1', is out of date, and possibly a security risk. [19:08:22] Info: Applications checked: 8 out of 9 [19:08:22] [19:08:22] System checks summary [19:08:23] ===================== [19:08:23] [19:08:23] File properties checks... [19:08:23] Required commands check failed [19:08:23] Files checked: 137 [19:08:23] Suspect files: 6 [19:08:23] [19:08:23] Rootkit checks... [19:08:23] Rootkits checked : 249 [19:08:23] Possible rootkits: 1 [19:08:23] Rootkit names : Xzibit Rootkit [19:08:23] [19:08:23] Applications checks... [19:08:23] Applications checked: 8 [19:08:23] Suspect applications: 5 [19:08:23] [19:08:23] The system checks took: 2 minutes and 13 seconds [19:08:23] [19:08:23] Info: End date is Wed Feb 10 19:08:23 CET 2010 Here is part of the output from the chkrootkit: Code: /usr/bin/find: head terminated by signal 13 /tmp/root/ispconfig/php/lib/php/build/run-tests.php /tmp/root/ispconfig/scripts/lib/classes/ispconfig_procmail.lib.php /tmp/root/ispconfig/scripts/lib/classes/ispconfig_system.lib.php /tmp/root/ispconfig/scripts/lib/classes/ispconfig_db_mysql.lib.php /tmp/root/ispconfig/scripts/lib/classes/ispconfig_string.lib.php /tmp/root/ispconfig/scripts/lib/classes/ispconfig_isp_file.lib.php /tmp/root/ispconfig/scripts/lib/classes/ispconfig_template.lib.php /tmp/root/ispconfig/scripts/lib/classes/ispconfig_bind.lib.php /tmp/root/ispconfig/scripts/lib/classes/ispconfig_postfix.lib.php /tmp/root/ispconfig/scripts/lib/classes/ispconfig_sendmail.lib.php /tmp/root/ispconfig/scripts/lib/classes/ispconfig_file.lib.php /tmp/root/ispconfig/scripts/lib/classes/ispconfig_log.lib.php /tmp/root/ispconfig/scripts/lib/config.lib.php /tmp/root/ispconfig/scripts/lib/config.inc.php /tmp/root/ispconfig/scripts/lib/server.inc.php /tmp/root/ispconfig/scripts/shell/quota_msg.php /tmp/root/ispconfig/scripts/shell/ftp_logs.php /tmp/root/ispconfig/scripts/shell/traffic.php /tmp/root/ispconfig/scripts/shell/check_services.php /tmp/root/ispconfig/scripts/shell/logs.php /tmp/root/ispconfig/scripts/shell/webalizer.php /tmp/root/ispconfig/scripts/shell/backup.php /tmp/root/ispconfig/scripts/shell/firewall.php /tmp/root/ispconfig/scripts/shell/mail_logs.php /tmp/root/ispconfig/scripts/shell/cleanup.php /tmp/root/ispconfig/scripts/writeconf.php /tmp/horde/imp-h3-4.1.1/lib/Auth/imp.php /tmp/horde/imp-h3-4.1.1/lib/IMAP/Client.php /tmp/horde/imp-h3-4.1.1/lib/IMAP/Search.php /tmp/horde/imp-h3-4.1.1/lib/IMAP/Tree.php /tmp/horde/imp-h3-4.1.1/lib/IMAP/Thread.php /tmp/horde/imp-h3-4.1.1/lib/IMAP/Sort.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/rfc822.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/plain.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/images.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/html.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/notification.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/zip.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/partial.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/tnef.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/related.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/itip.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/multipart.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/alternative.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/pkcs7.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/appledouble.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/pgp.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/status.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Viewer/enriched.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Contents.php /tmp/horde/imp-h3-4.1.1/lib/MIME/Headers.php /tmp/horde/imp-h3-4.1.1/lib/Identity/imp.php /tmp/horde/imp-h3-4.1.1/lib/Mailbox.php /tmp/horde/imp-h3-4.1.1/lib/Block/summary.php /tmp/horde/imp-h3-4.1.1/lib/Block/tree_folders.php /tmp/horde/imp-h3-4.1.1/lib/Crypt/PGP.php /tmp/horde/imp-h3-4.1.1/lib/Crypt/SMIME.php /tmp/horde/imp-h3-4.1.1/lib/Quota/cyrus.php /tmp/horde/imp-h3-4.1.1/lib/Quota/mercury32.php /tmp/horde/imp-h3-4.1.1/lib/Quota/command.php /tmp/horde/imp-h3-4.1.1/lib/Quota/logfile.php /tmp/horde/imp-h3-4.1.1/lib/Quota/courier.php /tmp/horde/imp-h3-4.1.1/lib/Quota/mdaemon.php /tmp/horde/imp-h3-4.1.1/lib/IMAP.php /tmp/horde/imp-h3-4.1.1/lib/prefs.php /tmp/horde/imp-h3-4.1.1/lib/version.php /tmp/horde/imp-h3-4.1.1/lib/Session.php /tmp/horde/imp-h3-4.1.1/lib/Fetchmail/imap.php /tmp/horde/imp-h3-4.1.1/lib/Filter.php /tmp/horde/imp-h3-4.1.1/lib/Maillog.php /tmp/horde/imp-h3-4.1.1/lib/Folder.php /tmp/horde/imp-h3-4.1.1/lib/Notification/Listener/status.php /tmp/horde/imp-h3-4.1.1/lib/Search.php /tmp/horde/imp-h3-4.1.1/lib/Maintenance/Task/fetchmail_login.php /tmp/horde/imp-h3-4.1.1/lib/Maintenance/Task/tos_agreement.php /tmp/horde/imp-h3-4.1.1/lib/Maintenance/Task/purge_trash.php /tmp/horde/imp-h3-4.1.1/lib/Maintenance/Task/rename_sentmail_monthly.php /tmp/horde/imp-h3-4.1.1/lib/Maintenance/Task/delete_sentmail_monthly.php /tmp/horde/imp-h3-4.1.1/lib/Maintenance/Task/delete_attachments_monthly.php /tmp/horde/imp-h3-4.1.1/lib/Maintenance/imp.php /tmp/horde/imp-h3-4.1.1/lib/api.php /tmp/horde/imp-h3-4.1.1/lib/IMP.php /tmp/horde/imp-h3-4.1.1/lib/Spam.php /tmp/horde/imp-h3-4.1.1/lib/Fetchmail.php /tmp/horde/imp-h3-4.1.1/lib/Message.php /tmp/horde/imp-h3-4.1.1/lib/Compose.php /tmp/horde/imp-h3-4.1.1/lib/Quota.php /tmp/horde/imp-h3-4.1.1/lib/base.php /tmp/horde/imp-h3-4.1.1/folders.php /tmp/horde/imp-h3-4.1.1/message.php /tmp/horde/imp-h3-4.1.1/compose.php /tmp/horde/imp-h3-4.1.1/stationery.php /tmp/horde/imp-h3-4.1.1/scripts/custom_login.php /tmp/horde/imp-h3-4.1.1/redirect.php /tmp/horde/imp-h3-4.1.1/spelling.php /tmp/horde/imp-h3-4.1.1/test.php /tmp/horde/imp-h3-4.1.1/login.php /tmp/horde/imp-h3-4.1.1/mailbox.php /tmp/horde/imp-h3-4.1.1/fetchmailprefs.php /tmp/horde/imp-h3-4.1.1/smime.php /tmp/horde/imp-h3-4.1.1/index.php /tmp/horde/imp-h3-4.1.1/acl.php /tmp/horde/imp-h3-4.1.1/fetchmail.php /tmp/horde/imp-h3-4.1.1/attachment.php /tmp/horde/imp-h3-4.1.1/search.php /tmp/horde/imp-h3-4.1.1/expand.php /tmp/horde/imp-h3-4.1.1/saveimage.php /tmp/horde/imp-h3-4.1.1/pgp.php /tmp/horde/imp-h3-4.1.1/filterprefs.php /tmp/horde/imp-h3-4.1.1/view.php /tmp/horde/imp-h3-4.1.1/recompose.php /tmp/horde/imp-h3-4.1.1/thread.php /tmp/horde/imp-h3-4.1.1/contacts.php Binary file (standard input) matches Searching for anomalies in shell history files... nothing found Checking `asp'... not infected Checking `bindshell'... not infected Checking `lkm'... chkproc: nothing detected chkdirs: nothing detected Checking `rexedcs'... not found Checking `sniffer'... eth1: not promisc and no PF_PACKET sockets Checking `w55808'... not infected Checking `wted'... chkwtmp: nothing deleted Checking `scalper'... not infected Checking `slapper'... not infected Checking `z2'... chklastlog: nothing deleted Checking `chkutmp'... The tty of the following user process(es) were not found in /var/run/utmp ! ! RUID PID TTY CMD ! root 6347 tty5 /sbin/mingetty tty5 ! root 6532 tty6 /sbin/mingetty tty6 chkutmp: nothing deleted Checking `OSX_RSPLUG'... not infected
Hi Edge, Tried to go through the link to find the problem as you suggested, http://www.howtoforge.com/how-to-log...tect-form-spam But the problem is that I’m stuck at point 2 Modifying the php.ini. Since we have Suse I am not sure in which php.ini file I should make the changes for the smtp-port. Code: mail:/etc # find / -name php.ini /etc/php5/cli/php.ini /etc/php5/fastcgi/php.ini /etc/php.ini /tmp/root/ispconfig/php/php.ini find: WARNING: Hard link count is wrong for /sys/devices: this may be a bug in your filesystem driver. Automatically turning on find's -noleaf option. Earlier results may have failed to include directories that should have been searched. /root/ispconfig/php/php.ini thanks to all who are helping!
Should be /etc/php.ini. If you are unsure, create the following PHP file: PHP: <?php phpinfo(); ?> and call it in a browser - it will tell you which php.ini is being used.
Also note that the mail.form file is not in /var/log/ as suggested in the howto, but in /tmp/mail_php.log
Hi Falko and Edge, I did as suggested in the howto, and on the browser I get the message that "Mail sent.", but both mail.form and mail_php.log are empty. I got the email inside(to a local email address) sent from "Administrator ISPConfig", but not when I changed to send to an address outside, but this is because our smtp-port is blocked from our internetprovider. But the log's are empty.
Please help... Dear HowToForge experts, I hope you have time to check this out and help us! Would really appreciate it! Here you will have the results of when we lookup our IP and mailserver, then you have the configurations of our ISPConfig, and at the end the main.cf and master.cf. As you look below, we use our ISP addresses as nameserver, even if we have declared our own nameservers in ISPConfig. Where and how can we make the changes so we don’t use our Internet providers address to send mail? Now they have blocked our smtp-port for outgoing from our school’s main IP address. When we check smtp.example.com, that we have been using in our emailusers configurations in Outlook as Outgoing mail server, this address actually is resolved to our ISP’s address (mx1.x.net) Another lookup: ISPConfig - Version: 2.2.18 Part of main.cf Code: readme_directory = /usr/share/doc/packages/postfix/README_FILES inet_protocols = all biff = no mail_spool_directory = /var/mail canonical_maps = hash:/etc/postfix/canonical #virtual_maps = hash:/etc/postfix/virtual relocated_maps = hash:/etc/postfix/relocated transport_maps = hash:/etc/postfix/transport sender_canonical_maps = hash:/etc/postfix/sender_canonical masquerade_exceptions = root masquerade_classes = envelope_sender, header_sender, header_recipient mydomain = example.com myhostname = xmail.$mydomain program_directory = /usr/lib/postfix inet_interfaces = all masquerade_domains = mydestination = $myhostname, $mydomain, localhost.$mydomain defer_transports = disable_dns_lookups = no relayhost = localhost mailbox_command = mailbox_transport = strict_8bitmime = no disable_mime_output_conversion = no smtpd_sender_restrictions = hash:/etc/postfix/access smtpd_client_restrictions = smtpd_helo_required = no smtpd_helo_restrictions = strict_rfc821_envelopes = no smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,check_relay_domains smtp_sasl_auth_enable = no smtpd_sasl_auth_enable = yes smtpd_use_tls = yes smtp_use_tls = yes alias_maps = hash:/etc/aliases mailbox_size_limit = 0 message_size_limit = 10240000 smtpd_sasl_local_domain = smtpd_sasl_security_options = noanonymous broken_sasl_auth_clients = yes smtpd_tls_auth_only = no smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom virtual_maps = hash:/etc/postfix/virtusertable mydestination = /etc/postfix/local-host-names Part of master.cf Code: /etc/postfix> cat master.cf # # Postfix master process configuration file. For details on the format # of the file, see the Postfix master(5) manual page. # # ========================================================================== # service type private unpriv chroot wakeup maxproc command + args # (yes) (yes) (yes) (never) (100) # ========================================================================== smtp inet n - n - - smtpd #submission inet n - n - - smtpd # -o smtpd_etrn_restrictions=reject # -o smtpd_client_restrictions=permit_sasl_authenticated,reject #smtps inet n - n - - smtpd -o smtpd_tls_wrappermode=yes # -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes #submission inet n - n - - smtpd # -o smtpd_etrn_restrictions=reject # -o smtpd_enforce_tls=yes -o smtpd_sasl_auth_enable=yes #628 inet n - n - - qmqpd pickup fifo n - n 60 1 pickup cleanup unix n - n - 0 cleanup qmgr fifo n - n 300 1 qmgr #qmgr fifo n - n 300 1 oqmgr tlsmgr unix - - n 1000? 1 tlsmgr rewrite unix - - n - - trivial-rewrite bounce unix - - n - 0 bounce defer unix - - n - 0 bounce trace unix - - n - 0 bounce verify unix - - n - 1 verify flush unix n - n 1000? 0 flush proxymap unix - - n - - proxymap smtp unix - - n - - smtp # When relaying mail as backup MX, disable fallback_relay to avoid MX loops relay unix - - n - - smtp -o fallback_relay= # -o smtp_helo_timeout=5 -o smtp_connect_timeout=5 showq unix n - n - - showq error unix - - n - - error discard unix - - n - - discard local unix - n n - - local virtual unix - n n - - virtual lmtp unix - - n - - lmtp anvil unix - - n - 1 anvil #localhost:10025 inet n - n - - smtpd -o content_filter= scache unix - - n - 1 scache # # ==================================================================== # Interfaces to non-Postfix software. Be sure to examine the manual # pages of the non-Postfix software to find out what options it wants. # # Many of the following services use the Postfix pipe(8) delivery # agent. See the pipe(8) man page for information about ${recipient} # and other message envelope options. # ==================================================================== # # maildrop. See the Postfix MAILDROP_README file for details. # Also specify in main.cf: maildrop_destination_recipient_limit=1 # maildrop unix - n n - - pipe flags=DRhu user=vmail argv=/usr/local/bin/maildrop -d ${recipient} cyrus unix - n n - - pipe user=cyrus argv=/usr/lib/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user} uucp unix - n n - - pipe flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient) ifmail unix - n n - - pipe flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient) bsmtp unix - n n - - pipe flags=Fq. user=foo argv=/usr/local/sbin/bsmtp -f $sender $nexthop $recipient procmail unix - n n - - pipe flags=R user=nobody argv=/usr/bin/procmail -t -m /etc/procmailrc ${sender} ${recipient} Another thing: The mailq has not increased anymore - does this mean that the server is not trying to send more spam ? Have tried to send mail to outgoing addresses with changing the SMTP in Outlook to mail.example.com, server IP, xmail.example.com, but it returns with "Recipient address rejected: Relay access denied". Looking forward to your reply on how to solve this problem, or maybe we just have to reinstall the server? Thanks for your help!
In that case you should set up relaying: http://www.howtoforge.com/postfix_relaying_through_another_mailserver
