Hello all I would like to introduce myself , I am sysadmin in Zambia , and have been using qpopper for a few years now.
Unfortunately , over the past 2 days , I seem to be having a problem with my mail server. We are runing Slackware 7.1 , with sendmail 8.11.4 , procmail 3.22 and qpopper 4.0.3. What we are seeing is that when sendmail tries to deliver mail to all our users at once ( when we issue a blanket email to our subscirbers ), it will deliver half of the messages , and then give up with the message "timeout waiting for input from local during Draining Input" Meanwhile , qpopper sessions for the mailboxes that have NOT received the mailing yet begin to go into a "dead" state, and do not allow anyone to login. These sessions cannot be killed, and they increase as each person tries to pickup mail , until the cpu load average reported by the system causes the MTA to begin rejecting connections ( approximately 10 mins ) When the server gets to this state , it is nearly impossible to list the files in the mail spool directories ( it is still possible to move around the rest of the file system ). Has anyone come across such a strange phonomenon , is it a DOS attack ? I would appreciate any help offered. Kindest regards Jay Banda
