Sendmail equivalent of exim 'multi_domain' (i.e. GMail Compatability)

[JonB]

Hi,

We've noticed an increasing issue with GMail - they only now accept emails for 1 domain 'per transaction' (this is a change they apparently started making back in May 2012).

We now see a number of deferrals with 'Multiple destination domains per transaction is unsupported.' - causing email delays at least, and sometimes non-delivery.

As more and more people use GMail (and GMail provide email for some larger ISPs as well) - the chance of emails being sent 'to' a domain that uses GMail MX and cc'd / Bcc'd to another domain that also uses GMail MX is ever increasing.

Is there a way of telling sendmail for MX's that end in 'google.com' - to only deliver emails for 1 domain per connection to the MX?

Apparently in Exim they have 'multi_domain' which controls whether Exim will deliver to multiple domains per 'connection' to an MX.

Personally - it seems silly that GMail will have their MX be set for 2 or more domains, but when you connect to it it will only accept mail for the one domain - the second/third etc. always get deferred with the 'Multiple destinations not supported'.

So if there's some way of working around this with sendmail - that'd be great.

Thanks,

-Jon

[Andrzej Adam Filip]

I think it may be possible using http://MIMEDefang.org/ milter
(search for "stream by recipient").

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Andrzej A. Filip

[Andrzej Adam Filip]

I think is possible using stream_by_domain function or even better its
modified version to fit gmail "standards".

http://linux.die.net/man/5/mimedefang-filter

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Andrzej A. Filip