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From: Philippe Chaintreuil on 9 Jun 2010 13:35
One of our users sent a large (about 10MB) e-mail to Yahoo. Yahoo has
not been accepting it, they don't give a reason, they just disconnect
after getting the whole message:

------------------------------------------------------------------------
Jun 9 13:20:50 hobbes postfix/smtp[7398]: 02EB432E022: lost connection
with e.mx.mail.yahoo.com[67.195.168.230] while sending end of data --
message may be sent more than once
------------------------------------------------------------------------

Small messages make it through without a problem, and sending the same
message from a Gmail account works.

I've tried messing with MTU size (down to 950 from 1500), various
sysctl settings, DKIM signing and probably a few things I'm forgetting
about: to no avail.

The best I can find is this post:

http://article.gmane.org/gmane.mail.postfix.user/208435

But there's no resolution.

Can anyone suggest other things to try or other information to gather
so I can figure out what's wrong with my setup or what's wrong with
Yahoo (and how to work around it)?

Thanks.

-- Philippe Chaintreuil

From: Olivier MJ Crepin-Leblond on 9 Jun 2010 17:17


Le 09/06/2010 19:35, Philippe Chaintreuil a écrit :
> One of our users sent a large (about 10MB) e-mail to Yahoo. Yahoo has
> not been accepting it, they don't give a reason, they just disconnect
> after getting the whole message:
>
> ------------------------------------------------------------------------
> Jun 9 13:20:50 hobbes postfix/smtp[7398]: 02EB432E022: lost connection
> with e.mx.mail.yahoo.com[67.195.168.230] while sending end of data --
> message may be sent more than once
> ------------------------------------------------------------------------
>
> Small messages make it through without a problem, and sending the same
> message from a Gmail account works.
>
> I've tried messing with MTU size (down to 950 from 1500), various
> sysctl settings, DKIM signing and probably a few things I'm forgetting
> about: to no avail.
>
> The best I can find is this post:
>
> http://article.gmane.org/gmane.mail.postfix.user/208435
>
> But there's no resolution.
>
>

Alas, I never received any follow-up. I sense it could be a time-out due
to DSL - but I still don't understand why it only does it with Yahoo and
with no-one else.

Warm regards,

Olivier

--
Olivier MJ Crépin-Leblond, PhD
http://www.gih.com/ocl.html

From: Wietse Venema on 9 Jun 2010 17:19
Philippe Chaintreuil:
> One of our users sent a large (about 10MB) e-mail to Yahoo. Yahoo has
> not been accepting it, they don't give a reason, they just disconnect
> after getting the whole message:
>
> ------------------------------------------------------------------------
> Jun 9 13:20:50 hobbes postfix/smtp[7398]: 02EB432E022: lost connection
> with e.mx.mail.yahoo.com[67.195.168.230] while sending end of data --
> message may be sent more than once
> ------------------------------------------------------------------------
>
> Small messages make it through without a problem, and sending the same
> message from a Gmail account works.

Instead of tweaking, spend the effort to become whitelisted.

Wietse

From: Larry Stone on 9 Jun 2010 17:24
On Wed, 9 Jun 2010, Olivier MJ Crepin-Leblond wrote:

> Le 09/06/2010 19:35, Philippe Chaintreuil a écrit :
>> One of our users sent a large (about 10MB) e-mail to Yahoo. Yahoo has
>> not been accepting it, they don't give a reason, they just disconnect
>> after getting the whole message:
>>
>> ------------------------------------------------------------------------
>> Jun 9 13:20:50 hobbes postfix/smtp[7398]: 02EB432E022: lost connection
>> with e.mx.mail.yahoo.com[67.195.168.230] while sending end of data --
>> message may be sent more than once
>> ------------------------------------------------------------------------
>>
>> Small messages make it through without a problem, and sending the same
>> message from a Gmail account works.
>>
>> I've tried messing with MTU size (down to 950 from 1500), various
>> sysctl settings, DKIM signing and probably a few things I'm forgetting
>> about: to no avail.
>>
>> The best I can find is this post:
>>
>> http://article.gmane.org/gmane.mail.postfix.user/208435
>>
>> But there's no resolution.
>>
>>
>
> Alas, I never received any follow-up. I sense it could be a time-out due
> to DSL - but I still don't understand why it only does it with Yahoo and
> with no-one else.

Because it's Yahoo. Yahoo's defers mail for all sort of unfathomable
reasons. As Wieste just posted, the OP should jump through Yahoo's hoops
to become white-listed.

-- Larry Stone
lstone19(a)stonejongleux.com
From: Victor Duchovni on 9 Jun 2010 17:34
On Wed, Jun 09, 2010 at 01:35:03PM -0400, Philippe Chaintreuil wrote:

> One of our users sent a large (about 10MB) e-mail to Yahoo. Yahoo has
> not been accepting it, they don't give a reason, they just disconnect
> after getting the whole message:
>
> ------------------------------------------------------------------------
> Jun 9 13:20:50 hobbes postfix/smtp[7398]: 02EB432E022: lost connection
> with e.mx.mail.yahoo.com[67.195.168.230] while sending end of data --
> message may be sent more than once
> ------------------------------------------------------------------------

Make sure you don't have window-scaling enabled on your MTA, and that
path MTU discovery works through your firewall. If that does not solve it,
see other suggestions in thread.

--
Viktor.

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