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*nix Thread, sendmail relay error after exchange 2003 upgrade in Technical; recent upgrade to MS exchange 2003 since then sendmail relay is displaying Code: (I/O error: Input/output error) in mailq and ...
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    sendmail relay error after exchange 2003 upgrade

    recent upgrade to MS exchange 2003

    since then sendmail relay is displaying
    Code:
           (I/O error: Input/output error)
    in mailq and /var/log/maillog to addresses on the new exchange server.
    it seems to be fairly random - about 3-4 per day but never to any servers other than the exchange. most mail gets through.
    I get a constant ping to exchange server, IMHO network is good.
    not fscked the mail relay (do I need to?) I'm thinking problem with exchange but can't find any pointers.
    sendmail is sendmail-8.12.8-9.90

    Any ideas

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    Re: sendmail relay error after exchange 2003 upgrade

    checked the smtp service / settings / logs on the exchange box.

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    Re: sendmail relay error after exchange 2003 upgrade

    Isn't that error related to internal file I/O in sendmail, rather than to network transmit/receive?

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    Re: sendmail relay error after exchange 2003 upgrade

    Yes, that's correct Roberto. Basically it can't connect to the exchange box. It's only a temporary error though, it'll retry later. One thing I would check is if rDNS records for exchange are correct. Sendmail is very fussy about that. Failing that, break out your network monitoring tools. Nagios, Cacti, etc.

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    Re: sendmail relay error after exchange 2003 upgrade

    Thanks, this *seems* to be working now.
    There was an historic firewall rule in the relay preventing communication with one of the AD DNS servers, I guess it occasionally didn't get the PTR for the new exchange.

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    Re: sendmail relay error after exchange 2003 upgrade

    i know this isn't the question you asked, but have you considered 'upgrading' sendmail to a less brain damaged MTA like postfix or Exim?

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    Re: sendmail relay error after exchange 2003 upgrade

    yep, its at the bottom of the list of things to do.
    personally I'm happier with postfix, but in general the sendmail box is too reliable to 'fix' atm

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    Re: sendmail relay error after exchange 2003 upgrade

    If it ain't broke, etc?



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