Hello everyone, Our company uses a Fortigate 100E, previously we had a
email junk spammer so we decided to tag our emails. Slowly even non-junk
emails got tagged and it became a huge problem so we turned the tagging
system to discarded for SMTP. Howe...
Going to answer my own question. The emails suddenly routed to another
existing IP under our domain. That IP mailbox server is inactive. Our
main IP was somehow blacklisted suddenly and only Microsoft decided to
not use our main IP and switched to th...
