[Mailman-Users] Mailman b5 lockup

[Zeljko Vrba]

I'm experiencing lockups with qrunner process; this is the strace session:

send(6, "ehlo inje.iskon.hr\r\n", 20, 0) = 20
read(7, "250-inje.iskon.hr Hello root at loc"..., 4096) = 155
send(6, "mail FROM:<ex-yu-a-lista-admin at z"..., 53, 0) = 53
read(7, "250 <ex-yu-a-lista-admin at zamir.n"..., 4096) = 50
send(6, "rcpt TO:<oliver.sertic at fpzg.hr>\r"..., 33, 0) = 33
read(7, 

It blocks indefinetly in this last read. There exists no MX record for
the fpzg.hr domain. Is this a bug in mailman, sendmail or both? Or BIND?
I'm using mailman as a production-level mailing list system and this
is pretty urgent. Please help!