postfix problem

[Peter P.]

Log in to the server and telnet to iself at port 25. It should answer something
that starts with 220 <domain> (E)SMTP . If this works then you probably have a
reverse network problem (something filters out responses). You can run another
(or the same) SMTP daemon on a different non-standard port and test there. E.g.
25025 or such. This will then be a 'private' (not very) SMTP port. See
/etc/postfix/master.cf (add entries like smtp ... but with 25025 etc.)

In general try to separate network problems from server problems by testing each
separately. F.ex. you can enable the inetd echo protocol on port 25 and test it
remotely like that if you suspect that something is misrouting packets.

Peter P.


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