>Have any web hosters used the 'Relay for local hosts' to knock down Spam.
>The description is pretty vague. I'm looking for something that will check
>the From field in the email and verify it against the virtual hosts we have.
>Is this what this field does?
Yes, but be aware that that allows any spammer that wants to to send as
much mail through your server as they want to.
>We have many domains hosted and users connecting from everywhere and
>anywhere so we can't restrict via IPs or domains.
That's where SMTP AUTH comes into play. Or, you can let spammers use your
service for free, while charging your customers to send mail that may be
blocked because of the spammers...
To not be an open relay, you can either use IMail's "Relay for addresses"
(in which case you would enter a list of "safe" IP addresses that your
users may come from; anyone not coming from those safe IPs would need to
use SMTP AUTH), or "No mail relay" (which really means that everyone must
use SMTP AUTH). Note that relay setting apply only to outgoing E-mail, so
no matter what your settings are, your users will still be able to get mail.
-Scott
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