Hanging SMTP sessions...

Hi all,

   anyone come across stuff like this? We are runing qmail 1.03, and i'm seeing
some strange things. I have a number of SMTP sessions which just hang, and
then time out. No mail is actually accepted from these sessions...

load is 0.00, so the processes are just hanging around for no reason...
and it's always the same sources...

Samples (from netstat)
0------------------
tcp 0 0 pg-mail.playground:smtp 204.187.152.24:3893 ESTABLISHED
tcp 0 0 pg-mail.playground:smtp 209.146.253.254:44124
ESTABLISHED tcp 0 0 pg-mail.playground:smtp 204.187.152.24:4565
ESTABLISHED tcp 0 0 pg-mail.playground:smtp orr.pwgsc.gc.ca:60495
ESTABLISHED tcp 0 0 pg-mail.playground:smtp pchgate.pch.gc.ca:37814
ESTABLISHED tcp 0 0 pg-mail.playground:smtp orr.pwgsc.gc.ca:61092
ESTABLISHED tcp 0 0 pg-mail.playground:smtp 204.187.152.24:1245
ESTABLISHED tcp 0 0 pg-mail.playground:smtp mail1.rogers.com:44081
ESTABLISHED tcp 0 0 pg-mail.playground:smtp ftp.compmore.net:3004
ESTABLISHED tcp 0 0 pg-mail.playground:smtp 204.187.152.24:1833
ESTABLISHED tcp 0 0 pg-mail.playground:smtp mail.quicken.ca:57669
ESTABLISHED tcp 0 0 pg-mail.playground:smtp jabba.galaxy.sout:43970
ESTABLISHED tcp 0 0 pg-mail.playground:smtp jabba.galaxy.sout:43974
ESTABLISHED tcp 0 0 pg-mail.playground:smtp mail.cyberus.ca:59054
ESTABLISHED tcp 0 0 pg-mail.playground:smtp neptunium.dowco.co:4925
ESTABLISHED tcp 0 0 pg-mail.playground:smtp macdonald.gallery:14792
ESTABLISHED tcp 0 0 pg-mail.playground:smtp ftp.compmore.net:3011
ESTABLISHED tcp 0 0 pg-mail.playground:smtp m1.eisa.com:20388
ESTABLISHED tcp 0 0 pg-mail.playground:smtp 192.197.69.17:51878
ESTABLISHED tcp 0 0 pg-mail.playground:smtp orr.pwgsc.gc.ca:36108
ESTABLISHED tcp 0 0 pg-mail.playground:smtp hades.edc-see.ca:3952
ESTABLISHED tcp 0 0 pg-mail.playground:smtp jabba.galaxy.sout:45472
ESTABLISHED tcp 0 0 pg-mail.playground:smtp orr.pwgsc.gc.ca:39246
ESTABLISHED tcp 0 0 pg-mail.playground:smtp jabba.galaxy.sout:45502
ESTABLISHED tcp 0 0 pg-mail.playground:smtp jabba.galaxy.sout:46075
ESTABLISHED tcp 0 0 pg-mail.playground:smtp fwd.rc.gc.ca:60801
ESTABLISHED tcp 0 0 pg-mail.playground:smtp mail.cyberus.ca:59837
ESTABLISHED tcp 0 0 pg-mail.playground:smtp 209.146.253.254:44880
ESTABLISHED tcp 0 0 pg-mail.playground:smtp 204.187.152.24:4960
ESTABLISHED tcp 0 0 pg-mail.playground:smtp 192.197.69.17:54598
ESTABLISHED tcp 0 0 pg-mail.playground:smtp jabba.galaxy.sout:46671
ESTABLISHED tcp 0 0 pg-mail.playground:smtp mail.cyberus.ca:60005
ESTABLISHED tcp 0 0 pg-mail.playground:smtp coal.sentex.ca:2764
ESTABLISHED tcp 0 0 pg-mail.playground:smtp orr.pwgsc.gc.ca:45323
ESTABLISHED tcp 0 0 pg-mail.playground:smtp jabba.galaxy.sout:46913
ESTABLISHED

Any help appreciated...

Thanks,
jason