On Tue, 30 Jan 2001, you wrote:
> John,
>
> Thanks. I didn't find anything on either site that described an open relay hole
> I have that should be plugged. The only thing I found that might be causing it
> is one line in my sendmail.mc file:
>
> dnl FEATURE(`relay_based_on_MX')
>
> This particular feature, if I understand it correctly, allows mail to be relayed
> to your site if it's addressed to one of your hosts. Meaning, a spammer could
> use my mail server to spam my own users, but not to relay mail to outside boxes,
> which near as I can tell is what is happening.
>
> I thought I had disabled it by adding in the "dnl" at the beginning of the line.
> Either I forgot to make a new sendmail.cf file, forgot to restart sendmail, or
> just adding in dnl at the beginning of the line didn't "comment" it out. I
> deleted the line, remade sendmail.cf, and restarted sendmail. I'll just have to
> wait and see if this fixes the problem.
>
Another thing is to make sure you don't have a "vulnerable" version of
SendMail. You might want to make sure you're upgraded to the latest version of
Sendmail.....
John
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