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How to reject spoofed email addresses?
Hi all
I have an older 5.2 server used for email. (yes plan to upgrade soon...)
We are getting a lot of nuisance emails that use spoofed but valid email addresses from our own domain, where the message is from and to the same address. I can view the header and see that the message originates from outside. I can also see in the mail log the message comes from off-site.
Is there an easy fix to check and block emails that have valid sender address, but come from outside our domain?
thanks
K -