Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Please help me with this issue: when sending emails with an email client like Thunderbird I have the error #1 as below. Some people who's trying to send me a message have the error #2. IP is not in any RBL and have good reputation. I can connect to the yahoo's mailserver with telnet and have no errors.

Error #1.

The message could not be sent because the connection to SMTP server timed out.

Error #2.

<>: 0 Validating Sender: Error: command not recognized

Logs are clean but I have many such errors which I do not understand:

Jul 24 06:37:12 www dovecot: imap-login: Disconnected: rip=, lip=, TLS handshake
Jul 24 06:37:12 www dovecot: pop3-login: Disconnected: rip=, lip=, secured
Jul 24 06:37:13 www postfix/smtpd[6575]: connect from localhost[]
Jul 24 06:37:13 www postfix/smtpd[6575]: lost connection after CONNECT from localhost[]
Jul 24 06:37:13 www postfix/smtpd[6575]: disconnect from localhost[]


Jul 24 07:29:33 www postfix/smtpd[8784]: 023E838B30:[]
Jul 24 07:29:34 www postfix/smtpd[8784]: lost connection after RCPT from[]
Jul 24 07:29:34 www postfix/smtpd[8784]: disconnect from[]

Here is the Postfix config file. Domain is pointed to the server via the MX record only.

uname -a
Linux www 2.6.26-2-xen-amd64

Thank you in advance for any help.

share|improve this question
Are all error #2 messages dealing with – user48838 Jul 27 '11 at 6:56
@user48838 Most of the 'lost connections' lines are from localhost but I see some other lines like the ones in my updated post. – Andrew Jul 27 '11 at 7:18

Due to the high occurrence of errors from what should be local connections as you have identified, you may want to take a closer look at the processes and overall system processing load.

share|improve this answer
There is no load on the server. Uptime shows 0.01% and netstat shows 137 total connections. – Andrew Jul 27 '11 at 7:29
Has the processes been restarted as part of the troubleshooting/determination efforts thus far? – user48838 Jul 27 '11 at 7:31
Sure, I restarted postfix and iptables with no success. – Andrew Jul 27 '11 at 7:44
How about a system reboot? Otherwise you might want to take a closer look at either Postfix or the internal process that is connecting to it. How are manual telnet connections directly to Postfix? – user48838 Jul 27 '11 at 8:02
I performed: telnet localhost 25 (and 465 then) and looks like everything to be ok. I cannot restart the server as I have limited sudo access. – Andrew Jul 27 '11 at 8:10

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.