Re:Protect domains that do not send email
by timando on Tuesday April 12, 2022 @02:26AM
(#30999304)
> nobody knows where to send a message until you setup your MX records
Not quite. RFC 974 says
It is possible that the list of MXs in the response to the query will
be empty. This is a special case. If the list is empty, mailers
should treat it as if it contained one RR, an MX RR with a preference
value of 0, and a host name of REMOTE. (I.e., REMOTE is its only
MX). In addition, the mailer should do no further processing on the
list, but should attempt to deliver the message to REMOTE.
Not quite. RFC 974 says It is possible that the list of MXs in the response to the query will be empty. This is a special case. If the list is empty, mailers should treat it as if it contained one RR, an MX RR with a preference value of 0, and a host name of REMOTE. (I.e., REMOTE is its only MX). In addition, the mailer should do no further processing on the list, but should attempt to deliver the message to REMOTE.