Am 09.05.2013 12:24, schrieb Héctor Moreno Blanco:
> I would like to reject an email if the MX does not exist. We have enable the 
> setting /reject_unknown_sender_domain/
> and /reject_unknown_recipient_domain/. However, if the domain has DNS and 
> resolves it, the message is sent, and we
> don’t want that

this is a completly broken idea

no RFC at this world says that a domain must have a MX record and many
do not - your idea would result in drop a lot of legit email

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