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.