This isn't *strictly* a qmail problem, but we are running qmail and seeing
some weird behavior.
I just upgraded our firewall to Redhat 7.0 w/ 2.2.16-22 kernel running
ipchains. We *were* at 2.0.38 w/ ipfwadm. Ever since, Outlook Express
(5.50.4522.1200) hangs in sending e-mail, but only in odd moments. (Eudora
Light 5.02 seems to work sporadically at best, Netscape 4.76 bombs in the
same way as OE, Mozilla 0.6 works just fine.) All running on Win98...
The temporary solution has been to run a packet sniffer like ``ngrep "*" -d
eth1 >& /dev/null''. For some bizarre reason, when the packet sniffer is
there, Outlook (and others) doesn't hang.
To try to track it down, I turned off the sniffer and attempted to send
e-mail. It hung. About five seconds after it hung, I started the sniffer up
again. After a second or two, it went through successfully.
The very first thing the sniffer found (all six times I ran this test, with
all of the problematic clients) was:
T 10.0.0.61:1060 -> 204.253.132.6:25 [AP]
0d 0a 2e 0d 0a .....
IIRC, that's "\r\n.\r\n" signifying the end of the DATA section, right?
Mail sent inside the firewall doesn't hang. Mail sent *anywhere* through the
firewall (via SMTP) hangs until either Outlook times out or the remote
server boots it. All other traffic remains unaffected; web browsing, for
instance, works just fine. I don't have any SMTP-specific firewall rules
either...
I've also asked on the linux-net mailing list, and am awaiting any thoughts
from there. Does anyone here have any clue what may be going on?
Thanks,
/pg
--
Peter Green : Gospel Communications Network, SysAdmin : [EMAIL PROTECTED]
---
After watching my newly-retired dad spend two weeks learning how to make a new
folder, it became obvious that "intuitive" mostly means "what the writer or
speaker of intuitive likes".
(Bruce Ediger, [EMAIL PROTECTED], in comp.os.linux.misc, on X the
intuitiveness of a Mac interface.)
