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The Internet Mail scanner isn’t sending email on your behalf, it is doing what it should, scan all mail sent by your system on SMTP port 25. The internet mail provider uses a localhost proxy to intercept and scan email before passing it on, this is the activity you are seeing and not the internet mail provider generating and sending email.

Now if you aren’t actually sending or receiving email at the time it is a good indication that you have either an undetected or hidden trojan spambot sending spam from your system.