I have a multiserver setup on Centos where Webserver and Mailserver on different machines. Postfix rewrites the Subject and from Address of the Mail. Postfix Sending out mails as hostusername@hostname (ex: [email protected]) instead of [email protected] ([email protected]) Example via PHP mail function: PHP: <?php mail('[email protected]', 'PHP Mail test', 'Testing PHP mail and Postfix', array('From' => '[email protected]','Reply-To' => '[email protected]')); echo "Test email sent";?> On Weserver (w1.webdomain.net): Code: [...] Feb 11 14:14:31 w1 postfix/smtpd[15704]: error: open database /etc/aliases.db: No such file or directory Feb 11 14:14:31 w1 postfix/smtpd[15704]: connect from w1.webdomain.net[x.x.x.1] Feb 11 14:14:31 w1 postfix/smtpd[15704]: CC30220CD: client=w1.webdomain.net[x.x.x.1] Feb 11 14:14:32 w1 postfix/cleanup[15707]: CC30220CD: message-id=<[email protected]> Feb 11 14:14:32 w1 postfix/smtpd[15704]: disconnect from w1.webdomain.net[x.x.x.1] Feb 11 14:14:32 w1 sSMTP[15703]: Sent mail for [email protected] (221 2.0.0 Bye) uid=1003 username=web8 outbytes=392 Feb 11 14:14:32 w1 postfix/qmgr[11584]: CC30220CD: from=<[email protected]>, size=530, nrcpt=1 (queue active) Feb 11 14:14:32 w1 postfix/smtp[15708]: CC30220CD: to=<[email protected]>, relay=mx.maildomain.net[x.x.x.2]:25, delay=1.2, delays=1/0.02/0.07/0.06, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as EF34E6C019A) Feb 11 14:14:32 w1 postfix/qmgr[11584]: CC30220CD: removed and on Mailserver (mx.maildomain.net): Code: [...] Feb 11 14:14:32 mx postfix/smtpd[26783]: connect from unknown[x.x.x.1] Feb 11 14:14:32 mx postfix/smtpd[26783]: NOQUEUE: filter: RCPT from unknown[x.x.x.1]: <[email protected]>: Sender address triggers FILTER lmtp:[127.0.0.1]:10026; from=<[email protected]> [email protected]> proto=ESMTP helo=<w1.webdomain.net> Feb 11 14:14:32 mx postfix/smtpd[26783]: EF34E6C019A: client=unknown[x.x.x.1] Feb 11 14:14:32 mx postfix/cleanup[28417]: EF34E6C019A: message-id=<[email protected]> Feb 11 14:14:32 mx postfix/smtpd[26783]: disconnect from unknown[x.x.x.1] Feb 11 14:14:32 mx postfix/qmgr[24748]: EF34E6C019A: from=<[email protected]>, size=712, nrcpt=1 (queue active) Feb 11 14:14:33 mx postfix/smtpd[28420]: connect from mx.maildomain.net[127.0.0.1] Feb 11 14:14:33 mx postfix/smtpd[28420]: B564F6C029E: client=mx.maildomain.net[127.0.0.1] Feb 11 14:14:33 mx postfix/cleanup[28417]: B564F6C029E: message-id=<[email protected]> Feb 11 14:14:33 mx postfix/qmgr[24748]: B564F6C029E: from=<[email protected]>, size=1147, nrcpt=1 (queue active) Feb 11 14:14:33 mx postfix/smtpd[28420]: disconnect from mx.maildomain.net[127.0.0.1] Feb 11 14:14:33 mx amavis[32235]: (32235-18) Passed CLEAN {RelayedOutbound}, ORIGINATING/MYNETS LOCAL [127.0.0.1] [x.x.x.1] <[email protected]> -> <[email protected]>, Message-ID: <[email protected]>, mail_id: 8NZFzlPMp6J1, Hits: 1.266, size: 712, queued_as: B564F6C029E, 758 ms Feb 11 14:14:33 mx postfix/lmtp[28418]: EF34E6C019A: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10026, delay=0.82, delays=0.05/0.01/0/0.76, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10027): 250 2.0.0 Ok: queued as B564F6C029E) Feb 11 14:14:33 mx postfix/qmgr[24748]: EF34E6C019A: removed Feb 11 14:14:34 mx postfix/smtp[28374]: B564F6C029E: to=<[email protected]>, relay=gmail-smtp-in.l.google.com[:::::]:25, delay=0.72, delays=0.01/0/0.4/0.3, dsn=2.0.0, status=sent (250 2.0.0 OK 1644585274 o11si6069890wrq.784 - gsmtp) Feb 11 14:14:34 mx postfix/qmgr[24748]: B564F6C029E: removed the Received Mail has the From address: Expected: [email protected] Actual: [email protected] [where 'web1' is the Linux user of Client and the Servername is the Webserver] and the "From Name" has the From Mailaddress ([email protected]) from above and not "myname" main.cf on webserver w1.webdomain.net: Code: alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5 html_directory = no inet_interfaces = all inet_protocols = ipv4 mail_owner = postfix mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain myhostname = w1.webdomain.net mynetworks = x.x.x.1, x.x.x.2 myorigin = $mydomain newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.10.1/README_FILES relayhost = mx.samadu.net sample_directory = /usr/share/doc/postfix-2.10.1/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtpd_banner = $myhostname ESMTP $mail_name unknown_local_recipient_reject_code = 550 main.cf on webserver mx.maildomain.net: Code: address_verify_negative_refresh_time = 60s address_verify_sender_ttl = 15686s alias_database = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases body_checks = regexp:/etc/postfix/body_checks broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix content_filter = amavis:[127.0.0.1]:10024 daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5 dovecot_destination_recipient_limit = 1 enable_original_recipient = yes greylisting = check_policy_service inet:127.0.0.1:10023 header_checks = regexp:/etc/postfix/header_checks html_directory = no inet_interfaces = all inet_protocols = all mail_owner = postfix mailbox_size_limit = 0 maildrop_destination_concurrency_limit = 1 maildrop_destination_recipient_limit = 1 mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man message_size_limit = 0 mime_header_checks = regexp:/etc/postfix/mime_header_checks mydestination = $myhostname, localhost, localhost.localdomain myhostname = mx.maildomain.net mynetworks = 127.0.0.0/8, [::1]/128, x.x.x.1, x.x.x.2 nested_header_checks = regexp:/etc/postfix/nested_header_checks newaliases_path = /usr/bin/newaliases.postfix owner_request_special = no proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $sender_bcc_maps $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks $smtpd_sender_login_maps $virtual_uid_maps $virtual_gid_maps $smtpd_client_restrictions $smtpd_sender_restrictions $smtpd_recipient_restrictions $smtp_sasl_password_maps $sender_dependent_relayhost_maps queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.10.1/README_FILES receive_override_options = no_address_mappings relay_domains = proxy:mysql:/etc/postfix/mysql-virtual_relaydomains.cf relay_recipient_maps = proxy:mysql:/etc/postfix/mysql-virtual_relayrecipientmaps.cf sample_directory = /usr/share/doc/postfix-2.10.1/samples sender_bcc_maps = proxy:mysql:/etc/postfix/mysql-virtual_outgoing_bcc.cf sender_dependent_relayhost_maps = proxy:mysql:/etc/postfix/mysql-virtual_sender-relayhost.cf sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtp_sasl_auth_enable = yes smtp_sasl_password_maps = proxy:mysql:/etc/postfix/mysql-virtual_sender-relayauth.cf, texthash:/etc/postfix/sasl_passwd smtp_sasl_security_options = noanonymous, noplaintext smtp_sasl_tls_security_options = noanonymous smtp_sender_dependent_authentication = yes smtp_tls_exclude_ciphers = RC4, aNULL smtp_tls_protocols = !SSLv2,!SSLv3 smtp_tls_security_level = may smtpd_client_message_rate_limit = 100 smtpd_client_restrictions = check_client_access proxy:mysql:/etc/postfix/mysql-virtual_client.cf, permit_inet_interfaces, permit_mynetworks, permit_sasl_authenticated, reject_rbl_client zen.spamhaus.org, reject_unauth_pipelining , permit smtpd_data_restrictions = permit_mynetworks, reject_unauth_pipelining, reject_multi_recipient_bounce, permit smtpd_etrn_restrictions = permit_mynetworks, reject smtpd_forbidden_commands = CONNECT,GET,POST,USER,PASS smtpd_helo_required = yes smtpd_helo_restrictions = permit_mynetworks, check_helo_access regexp:/etc/postfix/helo_access, permit_sasl_authenticated, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, check_helo_access regexp:/etc/postfix/blacklist_helo, , permit smtpd_recipient_restrictions = permit_mynetworks, reject_unknown_recipient_domain, reject_unlisted_recipient, check_recipient_access proxy:mysql:/etc/postfix/mysql-verify_recipients.cf, permit_sasl_authenticated, reject_non_fqdn_recipient, reject_unauth_destination, check_recipient_access proxy:mysql:/etc/postfix/mysql-virtual_recipient.cf, check_recipient_access mysql:/etc/postfix/mysql-virtual_policy_greylist.cf, check_policy_service unix:private/quota-status smtpd_reject_unlisted_sender = no smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination smtpd_restriction_classes = greylisting smtpd_sasl_auth_enable = yes smtpd_sasl_authenticated_header = yes smtpd_sasl_path = private/auth smtpd_sasl_type = dovecot smtpd_sender_login_maps = proxy:mysql:/etc/postfix/mysql-virtual_sender_login_maps.cf smtpd_sender_restrictions = check_sender_access proxy:mysql:/etc/postfix/mysql-virtual_sender.cf, reject_authenticated_sender_login_mismatch, check_sender_access regexp:/etc/postfix/tag_as_originating.re, permit_mynetworks,reject_sender_login_mismatch,, permit_sasl_authenticated, reject_non_fqdn_sender, reject_unlisted_sender, check_sender_access regexp:/etc/postfix/tag_as_foreign.re smtpd_tls_cert_file = /etc/postfix/smtpd.cert smtpd_tls_exclude_ciphers = RC4, aNULL smtpd_tls_key_file = /etc/postfix/smtpd.key smtpd_tls_mandatory_ciphers = medium smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3 smtpd_tls_protocols = !SSLv2,!SSLv3 smtpd_tls_security_level = may smtpd_use_tls = yes tls_medium_cipherlist = ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA tls_preempt_cipherlist = yes transport_maps = hash:/var/lib/mailman/data/transport-mailman, proxy:mysql:/etc/postfix/mysql-virtual_transports.cf unknown_local_recipient_reject_code = 550 virtual_alias_domains = proxy:mysql:/etc/postfix/mysql-virtual_alias_domains.cf virtual_alias_maps = hash:/var/lib/mailman/data/virtual-mailman, proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, proxy:mysql:/etc/postfix/mysql-virtual_alias_maps.cf, proxy:mysql:/etc/postfix/mysql-virtual_email2email.cf virtual_gid_maps = proxy:mysql:/etc/postfix/mysql-virtual_gids.cf virtual_mailbox_base = /var/vmail virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf virtual_transport = lmtp:unix:private/dovecot-lmtp virtual_uid_maps = proxy:mysql:/etc/postfix/mysql-virtual_uids.cf
I've never used sSMTP before, but a quick google search finds this page as the first hit which shows it's quite easy to configure if you don't like the current behavior: https://wiki.debian.org/sSMTP
