The mailing list filter was behaving.

The filter is supposed to remove quoted messages in posts that arrive on the forum via the mailing lists. This stops the same message appearing multiple times in each post to the forum.

It had been filtering out more than it was supposed to. Most would not have noticed as I had been manually repairing them.

The filter should now be fully functional. Messages from the list should have the message filtered so that a quoted message appears like this:

On xx/xx/xxxx, at xx:xx PM, xxx wrote:
> ...
_______________________________________________
OpenVPMS User Mailing List
users[at]lists.openvpms[dot]org
To unsubscribe or change your subscription visit:
http://lists.openvpms.org/mailman/listinfo/users

If anyone finds any posts in the forums that don't look like they should please let me know.