Well, if one is running a mail server with SSL encrypted POP/IMAP/SMTP, there shouldn't be any additional security implications, just a much busier spam filter as IG pointed out. Spammers rely on replies from mail servers to see how far they can get in terms of information gathering. An open relay could reveal a lot more than novices would be aware of, presuming that this was something that all ISp's adopted. I've worked with enough "senior technical" personnel to know that far too many either lied or conned their way into their jobs with either minimal or no actual expertise. No wonder big corporations are going bankrupt...something for another room, though. :)
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