How to improve spam filtering rules in Xeams

Out-of-the-box Xeams will block most junk messages sent to your server. However, you can take several steps to make the filtering better. The following section lists some tips.

Add an SPF record for your domain - An SPF record prevents email forgery.
Check the reason for spam - Every email contains a reason explaining how Xeams assigned a score to it. It is important that you check the reason for any email that is incorrectly marked and correct the problem.

Click Message Repository on the main menu to view existing messages and then hover your mouse over the reason link.
Mark emails correctly - If you see a message incorrectly tagged either as spam or good, mark them appropriately. Marking an email updates several filters and prevents future errors.
Use Spam Simulator - Use spam simulator to fine tune the rules.
Avoid white/black listing entire domains - Think twice before white listing entire domains, particularly if they are popular domains like Hotmail.com, Yahoo.com or GMail.com. White listing takes the score of the message too far in the negative zone and therefore, scores from other filters do not matter.

One common mistake many administrators make is that they white list their own domain name. Since email forgery is very common, every forged message will get through if the domain is white listed
Consider creating a temporary filter - Create temporary filters for innocent emails.