this post was submitted on 19 Jun 2023
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I've run into this issue with some of my servers in the past and it's a real PITA to deal with because not only do you have to mitigate the issue, but then you have to make requests to get de-blacklisted, etc. I finally got sick of it all and installed a Barracuda spam firewall in front of the mail server. I have MUCH easier control over IMAP/SMTP now.
I was vaguely aware of that, but I'm very glad that you posted this link because I didn't realize that it was this serious and that it hasn't been patched! My unit is completely up-to-date with firmware and patches, but I can't find an actual list of affected models ANYWHERE! I've taken a cursory look at my system and it doesn't appear to be compromised, but I emailed Barracuda for additional info. Thanks for this!