Author: Tomasz Chmielewski Date: To: Peter Bowyer CC: exim users Subject: Re: [exim] *Suspect* reject mail for user@example.com?
Peter Bowyer schrieb:
>> This causes lots of trouble:
>> - non-delivery reports get to false users (in case of rejected spam/viruses)
>> - we send unnecessary non-delivery reports for non-existing users; it
>> should be cut off as soon as someone connects to Exim
>>
>>
>> I know the proper way to do it would be to have an up-to-date list of
>> existing users on the Exim box for all "remote users", but it's not
>> always possible.
>
> That's a great use case for Exim's recipient callout verification. As
> long as the destination server rejects unknown recipients at SMTP
> time, your Exim will 'learn' (ie cache) which users are valid and
> which are not and reject invalid users.
This sounds good, I'll read about it.
> If mail is getting rejected at the destination for spam, you 'just'
> need to make sure that your own spam filtering is equally or more
> strict than the destination.
