You might not be aware that we automatically scan all messages, both incoming and outgoing, for viruses and other malware. We've been doing it for many years. It's a separate step and tool from the spam detection scanning that we also do.

A recent analysis of the malware scan logs, going back more than a year, shows that it is very, very rare to actually detect malware in the email passing through our system. Based on those same logs, there is a reasonable chance that some of those cases are false positives. That is, indications of malware in innocent messages.

Malware scanning on an email server is relatively resource-intensive, and it seems to provide very little -- in any -- value to our users. We have therefore discontinued that scanning as of 6 October 2019.