>What is the rule of thumb with regards to relaying. I am running a single
>IMail server. I have approximately 150 users. Most internal but about 40
>external who use web messaging. Should I set the SMTP security to No Mail
>Relay ?......Any suggestions would be greatly appreciated.
There's no rule of thumb. You can use "No mail relay" or "Relay for
addresses", it's your choice (any other option will allow spammers to send
mail through your server for free). Both require SMTP AUTH, with the
exception that "Relay for Addresses" doesn't require SMTP AUTH from users
coming from IP addresses that you list.
-Scott
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