Re: [exim] (110): Connection timed out

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Autor: Dennis Davis
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A: exim-users
Assumpte: Re: [exim] (110): Connection timed out
On Thu, 13 Nov 2014, Heiko Schlittermann wrote:

> From: Heiko Schlittermann <hs@???>
> To: exim-users@???
> Date: Thu, 13 Nov 2014 12:33:00
> Subject: Re: [exim] (110): Connection timed out


...

> Wilde guesses, none of these may be sufficient, it's just to explore and
> investigate the behaviour…
>
>     - tls
>     - ident callbacks
>     - different user (telnet you're using as root, exim is running as an
>       unpriviliged user)


Another wild guess would be possibly that the MTU value is too high
and hasn't been auto-negotiated down.

A few years ago the organisation I worked for had problems sending
email to a large UK organisation, the NHS. I vaguely remember
discussing the issue on this mailing list.

Turned out that reducing the MTU value of our outgoing mail host(s)
was a solution. Can't remember the exact details, but I think we
dropped the MTU from 1500 to 1400.

Doesn't explain how telnet connections work but exim connections
don't. Unless the test telnet connections are only using "small"
packets.
--
Dennis Davis <dennisdavis@???>