I decided to reboot the server and suddenly posftix is not working. I have the following error messages: from monit.log: Code: [GMT Feb 14 01:41:16] info : 'postfix' trying to restart [GMT Feb 14 01:41:16] info : 'postfix' stop: /etc/init.d/postfix [GMT Feb 14 01:41:16] info : 'postfix' start: /etc/init.d/postfix [GMT Feb 14 01:42:17] error : 'postfix' failed protocol test [SMTP] at INET[localhost:25] via TCP -- SMTP: error receiving data -- Resource temporarily unavailable from mail.log: Code: Feb 14 01:40:15 server1 postfix/master[2547]: daemon started -- version 2.9.6, configuration /etc/postfix Feb 14 01:41:15 server1 postfix/smtpd[2591]: connect from localhost.localdomain[127.0.0.1] Feb 14 01:41:15 server1 postfix/smtpd[2591]: warning: SASL: Connect to private/auth failed: Connection refused Feb 14 01:41:15 server1 postfix/smtpd[2591]: fatal: no SASL authentication mechanisms Feb 14 01:41:16 server1 postfix/master[2547]: warning: process /usr/lib/postfix/smtpd pid 2591 exit status 1 Feb 14 01:41:16 server1 postfix/master[2547]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling Feb 14 01:41:16 server1 postfix/master[2547]: terminating on signal 15 Feb 14 01:41:16 server1 postfix/master[2708]: daemon started -- version 2.9.6, configuration /etc/postfix Feb 14 01:42:16 server1 postfix/smtpd[2767]: connect from localhost.localdomain[127.0.0.1] Feb 14 01:42:16 server1 postfix/smtpd[2767]: warning: SASL: Connect to private/auth failed: Connection refused Feb 14 01:42:16 server1 postfix/smtpd[2767]: fatal: no SASL authentication mechanisms Feb 14 01:42:17 server1 postfix/master[2708]: warning: process /usr/lib/postfix/smtpd pid 2767 exit status 1 Feb 14 01:42:17 server1 postfix/master[2708]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling Feb 14 01:42:18 server1 postfix/master[2708]: terminating on signal 15 Feb 14 01:42:18 server1 postfix/master[2885]: daemon started -- version 2.9.6, configuration /etc/postfix from mail.err: Code: Feb 14 01:24:23 server1 postfix/smtpd[2625]: fatal: no SASL authentication mechanisms Feb 14 01:24:44 server1 postfix/smtpd[1295]: fatal: no SASL authentication mechanisms Feb 14 01:25:05 server1 postfix/smtpd[1378]: fatal: no SASL authentication mechanisms
Hi Bobpit, You need to change your dovecot.conf (/etc/dovecot.conf or /etc/dovecot/dovecot.conf, depending on your distribution) and make sure you have the following lines in it: Restart Dovecot. It will create /var/spool/postfix/private/auth . Finally in /etc/postfix/main.cf you need to modify as follows Finally restart Postfix. Br// Srijan
Hello srijan I did check and the entries you suggest are missing from the files. I am wondering, even if I do these changes and it does work. The server was working for over a month. I installed monit couple of weeks ago and after many restarts did not have this problem. Why suddenly this occured? There must be something else that went wrong. Only thing I can think off exactly a week ago I added another domain to the vps, through ispconfig3. I don't remember if I have rebooted the server after this. But ispconfig3 did restart services like nginx. So if this is the case, then I need to change some file that relates to the new domain. Right? But I am also wondering, why didn't ispconfig3 take care of these issues at the time I added the domain?
Which Linux distribution do you use? Do you use dovecot or courier imap? This cant be related, ispconfig is not able to alter these files. only the ispconfig installer can set them. So the most likely reason is that either there is another controlpanel like webmin installed which altered them or a linux system overwrote files. I explained that abobe. this file des not contain anything that needs to be altered when you add domains. this file is just installed one during initial server installation and does not need to be and does not get altered by ispconfig afterwards, unless you update ispconfig to a new version. As there might be mre files damaged on your server and the lines that srijan posted are not the only ones that are required if your config was overwritten, it is better that you let the ispconfig updater do the job to repair your server. run: cd /tmp wget http://www.ispconfig.org/downloads/ISPConfig-3-stable.tar.gz tar xvfz ISPConfig-3-stable.tar.gz cd ispconfig3_install/install php -q update.php and choose to reconfigure services during update.
I am not sure if devcot or courier imap are active (sorry). I may have deactivated them after following some guides (even from howtoforge) on how to optimize a server, since I do not need them. I can say that I do not intentionally use them or have installed them. I tried google on how to verify if they are active and running: Does this help? Code: root@server1:~# ps auxw|grep "dovecot" root 3494 0.0 0.0 4336 852 pts/1 S+ 09:15 0:00 grep --color=auto dovecot I searched in /var/log and could not find any devcot.log file. What I use is in my signature: Ubuntu 12.04 server Nginx 1.4.4 AFAIK, I do not have any other control panel and certainly I do not use anything else than ispconfig3. I will wait for a responce, before I run the script.
Hi Bobpit, Did you tried the ispconfig updater?? Please use that it will resolve your issue. Further reconfigure the services, it will the update all the config files which are missing in your server. Thanks Srijan
Hello srijan As I said: I certainly want the problem fixed, but I do not want to bloat my server with all available services and options. It took me some time to go through guides and remove several of them, (like the antivirus). I am hesitant to run the script. Will it only correct postfix and nothing else? For example I do not know if devcot or courier imap is running, I do not know if I need them and I do not know if altering them the problem will be fixed. The vps is running 2 proxy servers and nothing else. I need postfix so that monit can email (through gmail mailserver) error messages to the sysadmin. Nothing else. Additionally, I remember I made changes that I know will be affected and will need to be redone after an ispconfig3 update. I just need to check again my old notes for this.
Ok. Then you should have installed ispconfig in expert mode at the beginning and choose only to configure web services and not mail services. As you configured the email services, they got all connected together any by removing a service, other services will start to fail as e.g. postfix depends on dovecot. so what you can do is that you try to rename the postfix main.cf and master.cf files and then run dpkg-reconfigure postfix to get a new minimal postfx config file without dependencies to dovecot.
I just run the postfix configuration like you said: dpkg-reconfigure postfix It still does not work. Obviously I configured it wrong, as I did not have much clue what I was doing. Here are the options I set: Code: satelite option system mail name: server1.surf-anonymous.info SMTP relay host: blank Root and postmaster mail recipient: blank Other destinations to accept mail for (blank for none): server1.surf-anonymous.info, localhost, localhost.localdomain, [B]gmail.com[/B] Local networks: 127.0.0.0/8 [::1]/128 Use procmail for local delivery? NO Local address extension character: + Again, my only use right now is to get email alerts through GMAIL if something goes wrong. I don't know how ispconfig3 does it (I think I dissabled it). This is from monitrc: Code: set mailserver smtp.gmail.com port 587 username "[email protected]" password "xxxx" using tlsv1 with timeout 30 seconds .... set alert [email protected] ..... check process postfix with pidfile /var/spool/postfix/pid/master.pid group mail start program = "/etc/init.d/postfix start" stop program = "/etc/init.d/postfix stop" if failed port 25 protocol smtp then restart So if I run "dpkg-reconfigure postfix" again, what should I enter in the various options?
from monit log: Code: [GMT Feb 14 16:56:28] info : 'postfix' trying to restart [GMT Feb 14 16:56:28] info : 'postfix' stop: /etc/init.d/postfix [GMT Feb 14 16:56:28] info : 'postfix' start: /etc/init.d/postfix [GMT Feb 14 16:57:30] error : 'postfix' failed protocol test [SMTP] at INET[localhost:25] via TCP -- SMTP: error receiving data -- Resource temporarily unavailable from mail log: Code: Feb 14 16:56:28 server1 postfix/master[7696]: terminating on signal 15 Feb 14 16:56:29 server1 postfix/master[7861]: daemon started -- version 2.9.6, configuration /etc/postfix Feb 14 16:56:29 server1 postfix/qmgr[7864]: 27A509DD262: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:56:29 server1 postfix/qmgr[7864]: B5C689DD259: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:56:29 server1 postfix/qmgr[7864]: 1ACB09DD263: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:56:29 server1 postfix/qmgr[7864]: 946779DD264: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:56:29 server1 postfix/qmgr[7864]: BF17D9DD260: from=<[email protected]>, size=1153, nrcpt=1 (queue active) Feb 14 16:56:29 server1 postfix/qmgr[7864]: 051689DD25B: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:56:29 server1 postfix/local[7869]: fatal: main.cf configuration error: mailbox_size_limit is smaller than message_size_limit Feb 14 16:56:29 server1 postfix/qmgr[7864]: B51279DD261: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:56:29 server1 postfix/qmgr[7864]: 6009D9DD25E: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:56:29 server1 postfix/qmgr[7864]: EAEBB9DD25D: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:56:30 server1 postfix/master[7861]: warning: process /usr/lib/postfix/local pid 7869 exit status 1 Feb 14 16:56:30 server1 postfix/master[7861]: warning: /usr/lib/postfix/local: bad command startup -- throttling Feb 14 16:57:29 server1 postfix/smtpd[7907]: connect from localhost.localdomain[127.0.0.1] Feb 14 16:57:29 server1 postfix/smtpd[7907]: warning: SASL: Connect to private/auth failed: Connection refused Feb 14 16:57:29 server1 postfix/smtpd[7907]: fatal: no SASL authentication mechanisms Feb 14 16:57:30 server1 postfix/master[7861]: warning: process /usr/lib/postfix/smtpd pid 7907 exit status 1 Feb 14 16:57:30 server1 postfix/master[7861]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling Feb 14 16:57:30 server1 postfix/local[7911]: fatal: main.cf configuration error: mailbox_size_limit is smaller than message_size_limit Feb 14 16:57:30 server1 postfix/master[7861]: terminating on signal 15 Feb 14 16:57:31 server1 postfix/master[8028]: daemon started -- version 2.9.6, configuration /etc/postfix Feb 14 16:57:31 server1 postfix/qmgr[8030]: 27A509DD262: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:57:31 server1 postfix/qmgr[8030]: B5C689DD259: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:57:31 server1 postfix/qmgr[8030]: 1ACB09DD263: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:57:31 server1 postfix/qmgr[8030]: 946779DD264: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:57:31 server1 postfix/qmgr[8030]: BF17D9DD260: from=<[email protected]>, size=1153, nrcpt=1 (queue active) Feb 14 16:57:31 server1 postfix/qmgr[8030]: 051689DD25B: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:57:31 server1 postfix/qmgr[8030]: B51279DD261: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:57:31 server1 postfix/qmgr[8030]: 6009D9DD25E: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:57:31 server1 postfix/qmgr[8030]: EAEBB9DD25D: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 14 16:57:31 server1 postfix/local[8035]: fatal: main.cf configuration error: mailbox_size_limit is smaller than message_size_limit Feb 14 16:57:32 server1 postfix/master[8028]: warning: process /usr/lib/postfix/local pid 8035 exit status 1 Feb 14 16:57:32 server1 postfix/master[8028]: warning: /usr/lib/postfix/local: bad command startup -- throttling
set mailbox size limit and message size limit in ispconfig under System > server config > email to 0 and click on save.
They were already set to 0. I just saved it again. It still does not work. Monit still shows error: "connection failed to localhost:25 [SMTP via TCP]"
and you still get new errr lines with: fatal: main.cf configuration error: mailbox_size_limit is smaller than message_size_limit in /var/log/mail.log? Then check if these values are set to 0 in postfix main.cf as well.
No, these are the contents of my mail.log: Code: Feb 15 08:23:02 server1 postfix/smtpd[12901]: connect from localhost.localdomain[127.0.0.1] Feb 15 08:23:02 server1 postfix/smtpd[12901]: warning: SASL: Connect to private/auth failed: Connection refused Feb 15 08:23:02 server1 postfix/smtpd[12901]: fatal: no SASL authentication mechanisms Feb 15 08:23:03 server1 postfix/master[12859]: warning: process /usr/lib/postfix/smtpd pid 12901 exit status 1 Feb 15 08:23:03 server1 postfix/master[12859]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling Feb 15 08:23:03 server1 postfix/master[12859]: terminating on signal 15 Feb 15 08:23:05 server1 postfix/master[13019]: daemon started -- version 2.9.6, configuration /etc/postfix Feb 15 08:24:05 server1 postfix/smtpd[13061]: connect from localhost.localdomain[127.0.0.1] Feb 15 08:24:05 server1 postfix/smtpd[13061]: warning: SASL: Connect to private/auth failed: Connection refused Feb 15 08:24:05 server1 postfix/smtpd[13061]: fatal: no SASL authentication mechanisms Feb 15 08:24:06 server1 postfix/master[13019]: warning: process /usr/lib/postfix/smtpd pid 13061 exit status 1 Feb 15 08:24:06 server1 postfix/master[13019]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling Feb 15 08:24:06 server1 postfix/master[13019]: terminating on signal 15 Feb 15 08:24:06 server1 postfix/master[13178]: daemon started -- version 2.9.6, configuration /etc/postfix Feb 15 08:25:01 server1 postfix/pickup[13180]: A11C39DC332: uid=115 from=<munin> Feb 15 08:25:01 server1 postfix/cleanup[13256]: A11C39DC332: message-id=<[email protected]> Feb 15 08:25:01 server1 postfix/qmgr[13181]: A11C39DC332: from=<[email protected]>, size=731, nrcpt=1 (queue active) Feb 15 08:25:01 server1 postfix/local[13265]: A11C39DC332: to=<[email protected]>, orig_to=<root>, relay=local, delay=0.22, delays=0.19/0.02/0/0.01, dsn=2.0.0, status=sent (delivered to mailbox) Feb 15 08:25:01 server1 postfix/qmgr[13181]: A11C39DC332: removed Feb 15 08:25:06 server1 postfix/smtpd[13274]: connect from localhost.localdomain[127.0.0.1] Feb 15 08:25:06 server1 postfix/smtpd[13274]: warning: SASL: Connect to private/auth failed: Connection refused Feb 15 08:25:06 server1 postfix/smtpd[13274]: fatal: no SASL authentication mechanisms Feb 15 08:25:07 server1 postfix/master[13178]: warning: process /usr/lib/postfix/smtpd pid 13274 exit status 1 Feb 15 08:25:07 server1 postfix/master[13178]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling Feb 15 08:25:08 server1 postfix/master[13178]: terminating on signal 15 Feb 15 08:25:08 server1 postfix/master[13390]: daemon started -- version 2.9.6, configuration /etc/postfix Feb 15 08:26:08 server1 postfix/smtpd[13432]: connect from localhost.localdomain[127.0.0.1] Feb 15 08:26:08 server1 postfix/smtpd[13432]: warning: SASL: Connect to private/auth failed: Connection refused Feb 15 08:26:08 server1 postfix/smtpd[13432]: fatal: no SASL authentication mechanisms Feb 15 08:26:09 server1 postfix/master[13390]: warning: process /usr/lib/postfix/smtpd pid 13432 exit status 1 Feb 15 08:26:09 server1 postfix/master[13390]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling Feb 15 08:26:09 server1 postfix/master[13390]: terminating on signal 15 Feb 15 08:26:10 server1 postfix/master[13549]: daemon started -- version 2.9.6, configuration /etc/postfix Feb 15 08:27:10 server1 postfix/smtpd[13613]: connect from localhost.localdomain[127.0.0.1] Feb 15 08:27:10 server1 postfix/smtpd[13613]: warning: SASL: Connect to private/auth failed: Connection refused Feb 15 08:27:10 server1 postfix/smtpd[13613]: fatal: no SASL authentication mechanisms Feb 15 08:27:11 server1 postfix/master[13549]: warning: process /usr/lib/postfix/smtpd pid 13613 exit status 1 Feb 15 08:27:11 server1 postfix/master[13549]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling Feb 15 08:27:12 server1 postfix/master[13549]: terminating on signal 15 Feb 15 08:27:12 server1 postfix/master[13733]: daemon started -- version 2.9.6, configuration /etc/postfix As I said in the previous post (http://www.howtoforge.com/forums/showpost.php?p=309920&postcount=10), the problem must be the almost random options I entered when I reconfigured postfix. If you could point me to a very explanatory guide on how to setup postfix, it would be a breeze to do it.
Ok, so this issue is solved. Thats described in the perfect setup guide. The problem with your setup is now that you removed packages of your working setup and postfix depends on these packages and so you broke your mail setup. Please post you postfix main.cf file.
I reconfigured postfix with this command Code: dpkg-reconfigure postfix And I set those options: 1)General type of mail configuration: Satellite system 2)System mail name: surf-anonymous.info 3)SMTP relay host: smtp.gmail.com 4)Root and postmaster mail recipient: blank 5)Other destinations to accept mail for (blank for none): blank 6)Force synchronous updates on mail queue? NO 7)Local networks: 127.0.0.0/8 [::1]/128 (default) 8)Use procmail for local delivery? NO 9)Mailbox size limit (bytes): 0 10)Ler nowocal address extension character: + (default) 11)Internet protocols to use: all Detailed changes are recorded here: http://bbb-solutions.blogspot.gr/2014/02/using-gmail-with-postfix-as-smtp-relay.html postfix behaves MUCH better now. For example I run this test with success, postfix was able to send an email to my gmail address: Code: echo "Test mail from postfix" | mail -s "Test Postfix" [email protected] Here are the latest from mail.log: Code: Feb 15 19:03:33 server1 postfix/master[13865]: terminating on signal 15 Feb 15 19:03:39 server1 postfix/master[13997]: daemon started -- version 2.9.6, configuration /etc/postfix Feb 15 19:04:40 server1 postfix/smtpd[14016]: connect from localhost.localdomain[127.0.0.1] Feb 15 19:04:40 server1 postfix/smtpd[14016]: warning: SASL: Connect to private/auth failed: Connection refused Feb 15 19:04:40 server1 postfix/smtpd[14016]: fatal: no SASL authentication mechanisms Feb 15 19:04:41 server1 postfix/master[13997]: warning: process /usr/lib/postfix/smtpd pid 14016 exit status 1 Feb 15 19:04:41 server1 postfix/master[13997]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling Feb 15 19:04:42 server1 postfix/master[13997]: terminating on signal 15 Feb 15 19:04:43 server1 postfix/master[14133]: daemon started -- version 2.9.6, configuration /etc/postfix Feb 15 19:05:02 server1 postfix/pickup[14135]: 844169DC352: uid=115 from=<munin> Feb 15 19:05:02 server1 postfix/cleanup[14179]: 844169DC352: message-id=<[email protected]> Feb 15 19:05:02 server1 postfix/qmgr[14136]: 844169DC352: from=<[email protected]>, size=715, nrcpt=1 (queue active) Here is the postfix main.cf file: Code: # See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific: Specifying a file name will cause the first # line of that file to be used as the name. The Debian default # is /etc/mailname. #myorigin = /etc/mailname smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = /usr/share/doc/postfix # TLS parameters smtpd_tls_cert_file = /etc/postfix/smtpd.cert smtpd_tls_key_file = /etc/postfix/smtpd.key smtpd_use_tls = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. myhostname = server1.surf-anonymous.info alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases alias_database = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases myorigin = /etc/mailname mydestination = relayhost = smtp.gmail.com mynetworks = 127.0.0.0/8 [::1]/128 mailbox_command = mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = loopback-only html_directory = /usr/share/doc/postfix/html virtual_alias_domains = virtual_alias_maps = proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, proxy:mysql:/etc/postfix/mysql-virtual_email2email.cf, hash:/var/lib/mailman/data/virtual-mailman virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf virtual_mailbox_base = /var/vmail virtual_uid_maps = static:5000 virtual_gid_maps = static:5000 smtpd_sasl_auth_enable = yes broken_sasl_auth_clients = yes smtpd_sasl_authenticated_header = yes smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, check_recipient_access mysql:/etc/postfix/mysql-virtual_recipient.cf, reject_unauth_destination smtpd_tls_security_level = may transport_maps = hash:/var/lib/mailman/data/transport-mailman, proxy:mysql:/etc/postfix/mysql-virtual_transports.cf relay_domains = mysql:/etc/postfix/mysql-virtual_relaydomains.cf relay_recipient_maps = mysql:/etc/postfix/mysql-virtual_relayrecipientmaps.cf proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks $virtual_mailbox_limit_maps smtpd_sender_restrictions = check_sender_access mysql:/etc/postfix/mysql-virtual_sender.cf smtpd_client_restrictions = check_client_access mysql:/etc/postfix/mysql-virtual_client.cf smtpd_client_message_rate_limit = 100 maildrop_destination_concurrency_limit = 1 maildrop_destination_recipient_limit = 1 virtual_transport = dovecot header_checks = regexp:/etc/postfix/header_checks mime_header_checks = regexp:/etc/postfix/mime_header_checks nested_header_checks = regexp:/etc/postfix/nested_header_checks body_checks = regexp:/etc/postfix/body_checks owner_request_special = no dovecot_destination_recipient_limit = 1 smtpd_sasl_type = dovecot smtpd_sasl_path = private/auth # content_filter = amavis:[127.0.0.1]:10024 # receive_override_options = no_address_mappings message_size_limit = 0 inet_protocols = all # BBB removed this, followed this guide: http://www.digitalfaq.com/forum/guides-ispconfig/3261-how-optimize-ispconfig.html #content_filter = amavis:[127.0.0.1]:10024 #receive_override_options = no_address_mappings # BBB added those lines (guide: http://blog.bobbyallen.me/2013/12/30/using-gmail-with-postfix-as-an-smtp-relay/) smtp_use_tls=yes smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options = noanonymous smtp_sasl_tls_security_options = noanonymous
Since I only want to receive emails when an error occurs, I decided to drop postfix and use msmtp, a simple nullclient software. Worked like a charm. Case closed. (details of the installation here: http://bbb-solutions.blogspot.gr/2014/02/replace-postfix-with-msmtp.html)
