Dear Natraj,
Very Much senses able comment and good example to configure smtp on
desisted port. I was actually looking for something like this for a while,
how to configure smtp on non standard ports.
I love the community who put their affords and energy and deliver the
solutions in mailboxes directly.
Well Done Natraj, Thanks Dear All. ----
> You can run an smtp server on any port you want. The advantage to not
> using one of the standard ports is that you won't have as many attacks
> from spammers and password guessing attacks.
>
> The smtp parameters that are specified in main.cf are the default for
> all of your smtp servers however any of the parameters can be overridden
> in master.cf. So to define an smtp server on port 1234 which requires
> TLS (issued via a STARTTLS) and must have SASL authentication you would
> add the following entry to master.cf:
>
>
> 1234 inet n - n - - smtpd
> -o smtpd_enforce_tls=yes
> -o smtpd_sasl_auth_enable=yes
> -o smtpd_client_restrictions=permit_sasl_authenticated,reject
>
> The port number can also be any named port in /etc/services.
>
>
> For any public SMTP server on the internet, I believe the relevant RFC
> specifies that you must accept unauthenticated, unencrypted (NON-TLS)
> connections on port 25 (sort of obvious if you want to receive incoming
> mail from the Internet). What I do on my servers is to disallow
> relaying and authentication from my port 25 smtp server and require all
> of my mail clients to connect on the port that I designate, requiring
> TLS+SASL auth.
>
> Nataraj
>
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>
Thanks / Regards
Prabhpal S. Mavi
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