We set up a new servers at a data center this weekend and everything seemed to work fine until Monday and now our mail server is backlogged to the point of 3-500,000 messages waiting to be sent. Sometimes it will send immediately others we have not received since Monday.
I am willing to pay someone to help us today as my guy has tried everything.
My free advice would be that if you have 500,000 E-mails waiting to be sent, you've probably got a spammer on your hands.
IMail's SMTP Security options have a number of relaying choices. Of them, only 2 can be used safely (the rest cause you to be an open relay). The two safe options are "Relay for Addresses" and "No Mail Relay".
If you use IMail's "Relay for addresses", 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. If you use "No mail relay", everyone must use SMTP AUTH to relay mail. Note that relay settings apply only to outgoing E-mail, so no matter what your settings are, your users will still be able to get mail.
So to reiterate: "Relay for Addresses" or "No Mail Relay" are safe; everything else will allow spammers to send mail for free through your servers.
-Scott
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