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Old 01-28-2004, 05:49 PM   #1
Registered: Jan 2004
Distribution: freebsd 5.3, openbsd 3.6, slackware 10
Posts: 96

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Postfix - Open relay or not?

I was led to believe that a default install of postfix, configured with nothing but your hostname and domain name will not be an open relay. I can telnet to port 25 on localhost and manually send mail with HELO, MAIL, RCPT etc. What's to stop other people doing this when I open up the server to the world?

Old 01-28-2004, 07:47 PM   #2
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Registered: Nov 2000
Location: Seattle, WA USA
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The smtp server should only deliver mail to the local machine unless the mail is from the local machine.

Of course you can also implement SMTP Authentication which would allow deliver of mail to outside machines if it comes in from an authenticated user.
Old 01-29-2004, 05:30 AM   #3
Registered: Jan 2004
Distribution: freebsd 5.3, openbsd 3.6, slackware 10
Posts: 96

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Thanks, that puts my mind at rest. I was going to spend today implementing SASL authentication, but I wanted to make sure it was quite safe in the mean time.



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