It may have to do with squatted/parked domains and/or port 25 being closed by a firewall. Parked domains generally have A records for showing ads but often do not have MX records (or an open port 25). Instead of getting a bounce immediately, you may have to wait for a timeout when the sender makes a simple typo.
And then there are cases when parked domains do have port 25 open and/or an MX record. Different discussion. David Hofstee OpenText 2017-04-19 3:50 GMT+02:00 John Levine <[email protected]>: > In article <[email protected]> you write: > >However, under RFC 5321, section 5.1, I had always thought that without > >an MX, the system should revert to using the A record as an implicit MX. > > You are correct. > > On the other hand, these days domains that expect mail generally do > have MX records, so I can't blame them for treating the lack of MX > as a signal that the address is bogus. > > R's, > John > > _______________________________________________ > mailop mailing list > [email protected] > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop > -- -- My opinion is mine.
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