Re: What is the use of SMTP server

From: ynotssor ("ynotssor")
Date: 07/17/03 

Date: Wed, 16 Jul 2003 23:46:45 -0700

"Sony Antony" <sonyantony@hotmail.com> wrote in message
news:3eb007f1.0307162102.25cb4bc8@posting.google.com

> I was playing with sendmail and .forward file on my RH Linux system.
> When I added an email to the .forward file, sendmail faithfully sent
> it to the destination.
> But then I realized that nowhere had I specified my SMTP server.
> So I started investigating using strace ing sendmail.
> I found out that sendmail did not use an SMTP server at all. It did an
> MX query, got the mail gateway for the destination address domain, and
> sent the mail directly.

What are you talking about? sendmail *is* the smtp server on localhost:25 for whatever email client you used, acting as an smtp
client for the destination server.

If you don't specify an smtp server in your client configuration, the default is localhost. The mail transport agent (MTA) can be
sendmail, postfix, exim or whatever you have listening on port 25.

        tony 

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