I have a policy daemon which verifies quotas via smmapd. I have not
looked at it in a long time, but maybe it can be easily extended to
verify mailbox existence as well?

It is available at http://www.omniflux.com/devel/

It does have some shortcomings such as not supporting virtual domains,
but this is because I haven't needed that, not because it cannot be done.

-- 
Omni Flux

Farzad FARID wrote:
> Thanks to you and Eric Luyten for the information on the small overhead. 
> So until someone ports smmapd to Postfix I agree that the recipient 
> address validation setting is sufficient.


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