>>  Postfix expects an empty set (i.e. no rows returned) if it is to respond

>>  negatively that a virtual alias does not exist.
>>  Returning NULL does not equal no rows returned.
> 
> email builder:
>> Are you sure?? 
> 
> 100% confirmed. To return NOTFOUND, you MUST return NO RESULT.

So with NULL, Postfix must be trying to do something, like what, map and 
deliver to n...@example.com and failing? Because I'm finding the same result 
when returning NULL (rejected after RCPT TO with "Recipient address rejected: 
User unknown")

In any case, this is helpful to know so I can adjust my query appropriately.

Reply via email to