[Bulk] Re: [Pkg-exim4-users] Not all mail received

[Andreas Metzler]

On 2006-05-30 Alastair Davies <alastair_davies at yahoo.co.uk> wrote:
> Jeremiah Foster, Ross Boylan and andreas all wrote:
> ><much helpful advice for finding logs>

> The culprit was something else entirely, which I only discovered when my 
> first reply to the list was rejected with the message:

> <pkg-exim4-users at lists.alioth.debian.org>:
> 192.25.206.28 does not like recipient.
> Remote host said: 550-Verification failed for <alastair at aldavies.net>
> 550-It appears that the DNS operator for aldavies.net
> 550-has installed an invalid MX record with an IP address
> 550-instead of a domain name on the right hand side.
> 550 Unable to verify sender
> Giving up on 192.25.206.28.

> That's the first time I've had a message that I've sent returned to me, 
> but I guess this error is much more likely to affect mail that is sent 
> to me, isn't it? 

Yes, but. ;-) Mail hosts often test whether the envelope *sender* is a
deliverable address, to be sure that they would be able to send the
mail back (bounce) if they would not be able to deliver it to the
designated recipient.

> So I changed the IP address to "aldavies.net" (is that 
> right?) and at least one of my problem mailers is now sending me mail OK.

Looks ok, and
http://dnsreport.com/tools/dnsreport.ch?domain=aldavies.net is happy
with it. ;-)

> This would be consistent with there being no trace in my logs of the 
> missing messages, wouldn't it?  In other words, my exim4 was never 
> involved, since the remote mailer would never even have gotten so far as 
> to contact it.
[...]

Correct.
cu andreas
-- 
The 'Galactic Cleaning' policy undertaken by Emperor Zhark is a personal
vision of the emperor's, and its inclusion in this work does not constitute
tacit approval by the author or the publisher for any such projects,
howsoever undertaken.                                (c) Jasper Ffforde