Re: SMTP Looping and RBL problem (separate issues)

[Matti Aarnio <mea@nic.funet.fi>]

On Tue, Apr 03, 2001 at 07:06:47PM -0300, zmailer wrote:
> Hi,
> 2 things we found today using 2.99.54 on Solaris 2.6.
> 
> RBL/Policies:
... I will return to that latter ...
> 
> SMTP Looping:
> Today we found a spike on our DNS server (more or less 300 queries 
> per second). All the queries were for the A record of the same name.

	My work colleques reported the same yesterday, but didn't leave
	me a change to study it.

	With this report I was able to determine where it went wrong,
	and I just made CVS commit for related patch to support function
	at file  transports/smtp/getmxrr.c

> The problem was an smtp process. The message being processed was 
> for XX@qmx.net (apologies for publishing the domain, but it may help)
> The MX for this domain (ICE.QAX.net) didn't have an A record.

	Returning SERVFAIL, which seems to yeild EAI_AGAIN, which
	at some point in the code bailed out with  SS->mxcount set to
	one (the failed MX entry), while it should have been zero..
	(Bailed out before doing the assignment..)

> After enabling verbose we have the text at the end.
> this are just a couple of lines from a file which grove up to 3Mb in less
> than a minute.
> 
> BTW: the same address tested with 2.99.54 bounce saying:
>   Diagnostic texts:
>     smtp; 500 (DNS: MX host does not support SMTP: qmx.net)

	That it should have done.

...
> Hope all this info helps.
> Thanks.
> 
> Nicolás Baumgarten
> Pert Consultores 
> nico@pert.com.ar

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