I have a box on Freebsd running Exim,Courier & Squirrelmail for mail
services and apache web server.
My problem is,whenever I change the cisco switch port the box is connecting to,to different with exactly the same settings (speed and duplex modes),I always get this squirrelmail error when trying to send mail:
ERROR:Message not sent. Server replied: 354
I finally get to send mail after a few tries a factor that makes sending mails extremely slow even for mail clients like 'autlook'.The condition resumes back to its normal working operation immediately I go back to its former switch and port.A point to note here is, all other services like the web server in the box are not interfered with by any of this changes and run as normal...mail is the only service affected.In both cases the box and the switch are always in sync - duplex and port speed options.
I cant seem to find anything useful from the mail logs to assist me in sorting and now I have to stop this switchport-boxethernet 'bond' coz I have to upgrade the current switch.
Anyone with suggestions on what could be causing this and how I would go about in sorting it...please assist me.