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Hi Everyone,

I am helping a company with their network moving forward and they are using a Kerio on site mail server which I am unfamiliar with. They are starting to have some bounce back issues and I wanted to run them by the board first before I dive too deep into the issue.

Currently 3 people within the company (over 50 emails total) are starting to get bounce backs on certain emails, not all of them. She has sent me 2 examples so far of the bounce backs and it looks like the common message on both of them is that the message must be sent over TLS.

"Message must be sent over TLS (Mode: normal))X-Footer: aGVhdnloYXVsLmNvbQ== "

Any reason why this issue would not pop up when no changes (that I know of) have been made on the computers they are sending from? I don't overlook the computers on an ongoing basis, so I figured posting the question here to get some ideas first would be wise before I explore on my own.
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