Hi !!

>>> Personally I'd prefer that more mail admins learn to reject mail 
>>> outright, rather than accept and bounce.  Then I wouldn't have to deal 
>>> with the bounce or a callout.
>> This could be in a perfect world, we always try to reject at smtp time
>> but not all people could do that. Some very large spanish providers
>> (and many others around the world) just accept anything on the mx hosts
>> and then route the message to other hosts that know if the user really
>> exists so they cannot reject unknown users at smtp time.
>>
> These providers could (should?) do recipient callouts surely?

yes, they could do many things the right way but it's not easy to
change things in a big provider.

-- 
Best regards  ...

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