On Wed, 20 Mar 2002, Joon Guillen wrote:
> Does the SMTP service use the same port (25) to connect and forward the
> outgoing e-mails to its designated mail servers or do they use the ports
> above 1023? And, will the remote mail server need to respond to it (as an
> acknowledgement, or maybe something else)?
>
when connecting to remote mail servers, the destination port will always
be 25 (SMTP standard). while source port will always be above 1023 for
qmail running as a non-root process.
what acknowledgement are u referring to? the tcp handshake? you must
allow outgoing SYN packets towards remote destination port 25.
> I'm doing firewall rules, and I'd like the rules to be as specific as
> possible. I'm using qmail and qmail-smtpd btw.
qmail-remote is the subprocess that delivers outgoing mail from your mail
server. qmail-smtpd only receives incoming mail and is the one bound to
port 25 on your mail server.
pong
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