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Article: 942
From: Quentin Campbell
Date: 2006-05-25 07:13:46 -0400
Subject: Re: Milter-ahead & "no acceptable MX server" log message

Removal...........: milters-request@milter.info?subject=remove
More information..: http://www.milter.info/#Support
--------------------------------------------------------

I had meant to add that a worrying aspect of this problem is that it was
cleared after I restarted sendmail & milter-ahead. 

This suggests that my system may be at fault and is not correctly
recognising and dealing with an intermittent problem on the recipient
hosts.

Have you seen anything like this before?

Quentin
---
PHONE: +44 191 222 8209    Information Systems and Services (ISS),
                           University of Newcastle,
                           Newcastle upon Tyne,
FAX:   +44 191 222 8765    United Kingdom, NE1 7RU.
------------------------------------------------------------------------
Any opinion expressed above is mine and not that of Newcastle
University. 

-----Original Message-----
From: Quentin Campbell 
Sent: 25 May 2006 12:08
To: 'milters@milter.info'
Subject: Milter-ahead & "no acceptable MX server" log message

Milter-ahead appears to do the job expected of it but for a particular
site for which we are the mail gateway am seeing intermittently:

... sendmail[3384]: k4PAAKX4003384: Milter: to=<recip-1@XXX.AC.UK>,
reject=450 4.7.1 server xxx-local.xxx.ac.uk for <bloggs@XXX.AC.UK> not
answering 
... milter-ahead[25120]: 01239 k4PAAKX4003384: no acceptable MX server
... sendmail[3384]: k4PAAKX4003384: Milter: to=<recip-2@XXX.AC.UK>,
reject=450 4.7.1 server xxx-local.xxx.ac.uk for <fred@XXX.AC.UK> not
answering 
... cheviot53 sendmail[3384]: k4PAAKX4003384: milter_read(milter-ahead):
cmd read returned 0, expecting 5
... sendmail[3384]: k4PAAKX4003384: Milter (milter-ahead): to error
state
... sendmail[3384]: k4PAAKX4003384: Milter (spf-milter): write(D)
returned -1, expected 92: Broken pipe
... sendmail[3384]: k4PAAKX4003384: Milter (spf-milter): to error state
... sendmail[3384]: k4PAAKX4003384: Milter: to=<recip-3@XXX.AC.UK>,
reject=451 4.3.2 Please try again later
... sendmail[3384]: k4PAAKX4003384: Milter: to=<recip-4@XXX.AC.UK>,
reject=451 4.3.2 Please try again later
... sendmail[3384]: k4PAAKX4003384: from=<owner-ami@JISCMAIL.AC.UK>,
size=4256, class=0, nrcpts=0, bodytype=8BITMIME, proto=ESMTP,
daemon=MTA, relay=ictmailer1.itd.rl.ac.uk [130.246.192.56]

This is the site referred to in my previous postings. The 'mailertable'
entry is:

xxx.ac.uk      esmtp:xxx-local.xxx.ac.uk

and 'xxx-local.xxx.ac.uk' resolves to:

xxx-local.xxx.ac.uk.    364     IN      MX      10 nyota.xxx.ac.uk.
xxx-local.xxx.ac.uk.    364     IN      MX      10 uhura.xxx.ac.uk.

In the above log extract I see a message for 4 recipients but two get
treated one way by 'milter-ahead' and two another way.

There has been one reference to 'no acceptable MX server' in your mail
list archive (for 'milter-sender') but no response to the query that I
could find.

When I look at the code for 'milter-ahead' it appears that the "no
acceptable MX server" message arises because neither of the MX hosts
above respond within an acceptable time. It this correct?

If so is it reasonable to extend the timeout (120 units of what?) for a
wait to get a response from an MX host? I assume you have chosen your
current timeout value for a good reason.

Quentin 
---
PHONE: +44 191 222 8209    Information Systems and Services (ISS),
                           University of Newcastle,
                           Newcastle upon Tyne,
FAX:   +44 191 222 8765    United Kingdom, NE1 7RU.
------------------------------------------------------------------------
Any opinion expressed above is mine and not that of Newcastle
University. 


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