Don't know if it's your problem or not but the version of Sendmail you are using needs to upgraded to at least 8.11.6
There are holes that a user can use on a Linux system via sendmail in that version. See: www.sendmail.org --- Sonny Kupka Nothing But Net, Inc. At 02:15 PM 10/27/01 +0200, Jay Banda wrote: >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
