We currently 'scan' incoming email for spam, the system then sets the subject to say if it believes the message is spam and it can move messages to a spam folder. This is based on the 'Spamassassin' software. We are now trying out an additional spam scanner called Rspamd.
We will test this out through the following steps:
Customers may be interested in comparing the spam scores of their email and we welcome any feedback - email in to support. We'll update this post with the progress.
We are now adding additional Rspamd headers to incoming email.
We are seeing good results with rspamd - eg, it's catching some spam messages that Spamassassin does not. We will start to use Rspamd along side Spamassassin for scoring and marking emails as spam.