Over the past few weeks (it may have been happening for longer) I am getting mail being rejected from email addresses that used to work just fine.
I have been forced to add exceptions in the in the SMTP proxy in order to receive the previously rejected mail messages.
Given the amount of SPAM that hits the SMTP proxy, going though the list line by line checking for valid emails is not viable.
No settings on my firewall have been changed in a very long time. What's going on here?
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