About once a month I'll have a user that's bombarded by undeliverable emails (roughly 1,000+- of them). Each of these have one thing in common. A line that reads "X-Mailer: iPhone Mail ". Though they display the origin of the server as mine.
I am skeptical that it's coming from my server, primarily because I've exhausted any additional way to find it on my exchange server.
Is there a way to protect against these types of attacks or ways to some how trace where they could be actually originating from? I'm open to any suggestions really.
Thank you kindly!
Jesse
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X-Mailer: iPhone Mail Spoofing... Defense Suggestions?
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