>Doesn't it make sense that Relay for Local hosts only will mean that
>relaying will be allowed from users that are part of a local host. In other
>words, I will be able to send out mail, as long as I am a user in a local
>domain, but anyone else will not be able to send out any mail.
Yes.
But if I say that I'm from your domain, there's no way your mail server can
tell that I really am -- unless I authenticate myself, which requires SMTP
AUTH. Most spammers can easily claim to be a user on a local domain
("[EMAIL PROTECTED]", for example).
> When I choose the no mail relay, I can't seem to send mail out at all -
even
> from my client ( I am on a different IP network).
That's because you have to use SMTP AUTH ("My mail server requires
authentication" in your mail client).
> What if I set it up to relay for local users only? Is this any better than
> relay for local hosts only?
Both allow a spammer to send mail from "[EMAIL PROTECTED]".
-Scott
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