[olug] qmail relay problem

[Christopher Cashell]

At Tue, 04 Mar 03, Unidentified Flying Banana neal r, said:
>    I've been getting messages periodically from various places
> indicating that my SMTP server is an open relay - I've got it configured
> to relay for a limited number of internal addresses. I went to abuse.net
> and used their web query thing and I did get this result  -  it appears
> that the machine is at least accepting this form of spam - anyone know
> how to lock this down?

Have you tried testing it manually?

What are you using to allow for connection handling and relaying?  Are
you using tcpserver?  Assuming so, do you have the tcpserver cdb setup
to only allow internal addresses to relay?  And do you have the QMail
rcpthosts file setup properly?

> >>> RSET
> <<< 250 flushed
> >>> MAIL FROM:<spamtest@[63.170.238.6]>
> <<< 250 ok
> >>> RCPT TO:<relaytest%abuse.net@[63.170.238.6]>
> <<< 250 ok

There are certain configurations where QMail will initially appear to be
accepting a message, but will later reject it.  It's hard to say with
100% certainty without testing it.

I'd suggest testing it manually, either via telnet to port 25 if you're
comfortable with basic SMTP commands, or by grabbing the rlytest utility
(google for it and you'll find it, it's a simple perl script; just edit
it so it sends the e-mail back to you, so you can see if it's getting
through (though, you might have to use an "alternate" address, so it
doesn't get let through as valid mail).

Feel free to contact me if you're still having trouble.

-- 
| Christopher
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| A: No.                                         |
| Q: Should I include quotations after my reply? |
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