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Hot topics
Submitting a false positive or false negative
This article explains how you can send false spam positives and false spam negatives to Proofpoint for further analysis.
Ensuring that a mail server is responding
This article describes how you can check whether a mail server is responding or not. It explains how to do this in principle and provides links to more extensive troubleshooting material.
Understanding SMTP return codes
This article provides information about the Simple Mail Transfer Protocol (SMTP) return codes.