Hi there,

On my setup I verify the validity of my email addresses using the VRFY/RCPT
TO method.

Today the backend MTA which reply to ASSP for this kind of check got some
trouble and replied with a temporary error (421).

The issue is that ASSP replied with an error 550 to the client MTA which
push some confusion because the sender think that the recipient address
doesn't exist but it's false.

Moreover I'm pretty sure that ASSP wrote in his cache that the address
doesn't existe as well.

It could be more convenient to reply by a 421 in this particularly case
don't you ?

Renaud
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