A few days ago to install a mail server using Courier-MTA, the truth is a bit complicated as I had to add a local DNS Bind 9 to resolve the same domain as the MTA. In tests with the staff all the way well received and delivered the mail for local accounts correctly, until a few hours. It is that outlook express nothing the customer started to give error messages in passwords, in addition to sending and receiving of mail was very slow. As he had no physical access to the mail server via ssh and was too slow, spend several hours imagining the possible problem and trying to fix everything blindly. Memory Problem Slow swap the whole system ... Read the full article »