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E-Mails blocked by Sophus

Matthias Gaede 
Ladies and Gentlemen

we run 2 Exchange email servers. Since two of our users fell for phishing emails, their email accounts were misused to send numerous spam emails.
We have blocked the accounts of our affected users so that spam will no longer be sent. We have also had our mail server IP addresses removed from various blacklists.

Delisting is only not possible with the “UCEPROTECT” blacklist.

Now some of our emails are still being blocked with the following error message:

"550-Sophos Anti Spam Engine has blocked this Email because the sender IP 550 Address is blacklisted.".

Is there a way to have the IP addresses of our 2 mail servers removed from the Sophos blacklist?

Please provide feedback, kind regards
Matthias Gaede


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