To make things worse, if you attempt to open an smtp connection to the helo host to verify they are at least a real mail server, you get a valid response.
try telneting to port 25 of any bogus .com or .net - you will see...
220 snubby1-wceast Snubby Mail Rejector Daemon v1.3 ready
this is a real bummer :)
but it apparently gives "550 reject" for all recipients.
Which is more "courteous" than not responding at all on port 25, which would cause your outbound MTA to tie up an SMTP process for <smtp timeout>, maybe several minutes or 10s of seconds. The 550 SMTP dialog should take a second or two max.
Len
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