Serious Postfix weirdness
elekktretterr at exemail.com.au
Fri Nov 14 01:19:08 PST 2008
I have got reports about lost mail(not received, im the receiver not the
sender) recently and trying to find out whats going on seems to be beyond me.
Basically a lot of email is lost with "timeout after DATA"
timeout after DATA (0 bytes) from mail.securepay.com.au[22.214.171.124]
. Supposedly the problem here is that the sending machine has got a firewall
in front of it thats blocking ICMP MUST FRAGMENT. I somewhat could verify
this by trying to ping those machines and indeed pinging them does not work.
On the Postfix website it suggests lowering MTU, so I lowered it from 1500 to
1000, but this did not improve the situation at all. Some suggest disabling
PIPELINING, so i did that but it didnt work either.
I took a tcpdump of one of these and attached it to this email. (daria is the
name of the mail server)
The system is running DragonFly 2.0.0 with ETHER_INPUT_CHAIN and ETHER_INPUT2
Just a note about my setup: The server is running behind a Cisco ADSL Router
that connects to a Cisco switch and the server connects to the switch.
Any Postfix gurus here that could help me figure this problem out?
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