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Old 9th December 2011, 04:45
Happy Happy is offline
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Default Ubuntu Linux 10.04-mail issues

I installed The Perfect Server - Ubuntu Lucid Lynx (Ubuntu 10.04) [ISPConfig 2] some months ago and it has been running fine up until lately. I am only using the following peices pop3/imap using Maildir format and therefore installed Courier-POP3/Courier-IMAP. Alo Mysql,postfix. At any rate here are my issues
1. Mail seems to be getting delivered most of the time, but all i see copies of it staying on the server after it is delivered.
2. I have some clients stating that they can't send me email with the following errors
A. #550 4.4.7 QUEUE,EXPIRED
B. Router :Failed to connect to SMTP host xxx.net because: The remote server is not a known TCP/IP host.
I can telnet to port 25. When I check MX Tools it reports no issues with mail server.

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Happy
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Old 9th December 2011, 10:30
falko falko is offline
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Are there any errors in your mail log (in the /var/log/ directory)?

Where is your server located? In a data center, or at home/in your office?
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Old 15th December 2011, 00:39
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No errors in logs. However, after talking with users found that some users had the box checked on their email client to leave a copy on server-this would explain seeing emails in users mail box on server. The mail server is located in a office. However, I am still trying to troubleshoot errors reported by users sending emails to our mail server
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Old 15th December 2011, 19:25
falko falko is offline
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Do you have a dynamic IP address? That might be a problem (if the IP changes, this might cause connection problems).

Your ISP doesn't block port 25, right?
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Old 5th January 2012, 05:41
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IP address is static and port 25 is allowed. However, I did notice that when I ran MXtool SMTP Diagsthe transactions time was less than desirable as noted below

OK - x.x.x.x resolves to mail.x.x.x.org
OK - Reverse DNS matches SMTP Banner
0 seconds - Good on Connection time
Not an open relay.
8.252 seconds - Not good! on Transaction time
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