Got a strange one here and maybe I'm missing something obvious.
Got a machine running Cent5 86-bit under Xen (2.6.24-19-xen #1 SMP Sat
Jul 12 00:15:59 UTC 2008 x86_64 x86_64 x86_64 GNU/Linux). When a
messages comes in from [email protected], it hangs with no logs
(example telnet session):
j...@jake-desktop:~$ telnet 299.264.8.16 25
Trying 299.264.8.16...
Connected to 299.264.8.16.
Escape character is '^]'.
220 box - Welcome to the box mail server ESMTP
HELO jake-desk
250 box - Welcome to the box mail server
MAIL FROM: [email protected]
And will sit there.
From the real Paypal IP address it will act the exact same way, except
eventually I'll see tcpserver fail (5 mins or so) in the logs with an
error 256 in the smtp logs. Nothing else besides a connection coming in
from my IP address.
If I add the IP to the tcp.smtp file:
66.211.168.230:allow,RELAYCLIENT="",RBLSMTPD="",NOP0FCHECK="1",SENDER_NOCHECK="1"
It will allow the message through as it should. I've tried with and
without RBL changes (before the tcp.smtp change) with no effect either way.
Am I missing something obvious or has anyone else seen this before? I
tried running the same simulation on one of my production servers and it
acted like it should (accepting the message). And it seems that Paypal
is the ONLY one it's happening to.
Thanks.
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