We had the 'Relay for IP Addresses' option on for IMAil, to enable us to be able to send mails origination from the webbased forms on our websites. The IP addresses specified was that of the web server where the sites are hosted. Lately we noticed a huge amount of relay happening through our IMail, and so we switched to the 'No Relay' . This has stopped the relay. But what remains unexplained is how was mail being relayed, if the option was 'Relay for IP Addresses' . Is there some loophole? Need some answers as, 'No Relay' cannot be a permanent solution for us. Nee to switch back to a ''Relay for IP Addresses'', to enable the email traffic originating from our sites.
The first thing to do is upgrade IMail to the latest version that you are entitled to -- it looks like you are running 7.00, and there have been many fixes since then. While you are at it, you may also want to upgrade your mail client -- it is sending non-RFC-compliant E-mail headers.
The key piece of information here, however, is what IP ranges did you include in "Relay for Addresses"? For example, if you were to include "0.0.0.0 - 255.255.255.255", anyone would be able to relay through your server.
-Scott
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