![]() To be fair, even without filter the server must handle the unencrypted mail at some point, if the sender/receiver is external. They still say they "can't read anything" despite anything running through their spam filter is not secure from admins and developers. they encrypt the received mail after filtering it / filter after decrypting before sending. This gives us a very limited window to perform spam filtering on incoming messages. The checksums are done in such a way that it is also effective against mutating spam emails.Īll this is done in memory so that by the time anything is permanently stored to disk, the email is already un-readable to us. ![]() If there is a match, we mark the message as spam. Next, we generate checksums of incoming messages and check them against a database of known spam messages. Secondly, the message is passed through our customized Bayesian filters which marks suspicious messages as spam. If we receive a hit, the message is rejected. As you hint in your third point, it's a difference if the mail is from and to a Protonmal account, or if one side is an third-party server.įor the cases where the sender or receiver (one of them) is not a Protonmail user, they DO read the mail, as they say themselves: įirst, the IP address of the incoming SMTP server is checked against spam blacklists which contain IP addresses of servers we have previously received spam from. ![]()
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