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Re: msgbuffer IO-error and GateDefender

On Thu, Jul 07, 2005 at 12:59:03PM +0200, Anton Velo wrote:
> Hi,
> We're having a problem in a zmailer gateway with mail directed
> to some domains.   These domains have a Panda Gatedefender
> appliance in front of their Exchange mail servers.
> The Error line in our maillog says:
> stat=deferred smtp; 500 (msgbuffer write IO-error[1]! [Resource temporaly unavailable] DATA 63147/123956 [51%]) 
> More data is that apparently, messages shorter than 63K are received
> by them without trouble, and the cut is always apparently at 63147.
> We have zmailer version 2.99.56 with Mailscanner (I supose it must not
> affect), and standard smtp TA for outgoing mail.
> Is anybody having a similar issue?

  I have never seen such box, but badly behaving firewalls
  are not a new phenomena...

  It looks like an SMTP server that does a store and forward
  processing..  e.g. the SMTP session terminates at that box.

  You might get messages to go thru, if you route them thru
  'smtp77' channel (e.g. intentionally disable every extension
  beyond basic half-duplex RFC 821).  If it helps, I am most
  curious about the difference of SMTP protocol at network level
  in both cases, e.g. tcpdump (or snoop) of related network traffic:
      tcpdump -s 9999 -w tcpdump.  host
  and after route change:
      tcpdump -s 9999 -w tcpdump.  host

  If that doesn't help, perhaps the snoops give me some ideas...

> Thanks
> Antón

/Matti Aarnio	<mea@nic.funet.fi>
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