9. Filtering Spam
Spam can be very annoying to subscribers, moderators, and owners of maillists. Subscribers stand an increased risk of receive copies of spam even if they have taken good care over the configuration and management of their own email account; Moderators can be swamped with moderation messages relating to spam that has arrived at the list address; Owners may receive spam that has been detected as (un)subscription requests, complaints from list users, and complaints from third parties who have ended up involved.
In the Settings panel there are two Spam filtering options that control how the Oxmail spam scoring system is used to reduce spam on your maillist: Enable and Level. By default these options ignore spam scoring - all mail goes through. This is to ensure that a newly create list will faithfully transmit all posts.
- Subscription policy: if you manually control list membership and do not provide a list archive then turning off Subscription option 1 can reduce spam, and "back-scatter" resulting from spammers sending mail to the (un)subscription / archive addresses leading to an automated maillist response being sent to the (often forged but valid) sender address used by the spammer
- Posting options: options 1, 2, and 5 can be used to prevent the list from accepting spam sent from any email address except those specified in your list configuration
- Header-based filters: configuring your list to reject mail with the Precedence: bulk or Precedence: junk may help to block some forms of circular or unsolicited commercial email