Last time I posted here, I had an issue where I couldnt get mail to be sent or received. At the time I was working on a fresh Debian Squeeze install on a VPS, and i-mscp was the only thing on it. The issue was that sendmail was using port 25, and it couldnt be used for postfix. Hence roundcube have an error :
At that time it was fixed by nuxwin who helpfully remote logged into my session, and removed sendmail, fixed my hostname, and it was all good.
Currently I am in the exact same situation. netstat shows that sendmail is hogging port 25, however I'm quite unable to completely remove it. I did an apt-cache search for anything beginning with sendmail, and accordingly purged these packages: sendmail-base, sendmail-bin, sendmail-cf and sendmail-doc. apt reports that the package sendmail isnt installed either. However even after everything, an apache restart and a cold reboot later, sendmail still occupies port 25, and I have no clue how to go about removing it.