linux - Should I see email on port 25 with netcat? -


assuming have domain forwarded box (i.e., can see webpage on box outside world) if use netcat listen on ports ssh session:

nc -l 587  nc -l 25

and send mail server user@mydomain.com

i should see beginning of handshake in send attempts? know isp not block port 25 because can see browser header netcat if go http://mydomain.com:25

tons of things going wrong:

1) smtp requires server talk first, email sender waiting server something.

2) if you're not running valid mail server, email senders may mark host unresponsive , backoff several hours before retrying.

3) if changed dns, may take hours/days propagate. (not respects ttl, low ones.)

4) servers configured drop mail if source or destination spf isn't set properly. (to encourage use spf.) try adding spf record. (and make sure mx record correct.)


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