GreenAnt uses an advanced filtering system based on [sieve](https://en.wikipedia.org/wiki/Sieve_(mail_filtering_language).
This mail filtering happens before the mail is deleivered and allows powerful functions including:
- auto-deliver to a mailbox
- adjust SPAM thresholds
- auto-respond and vacation messages
- multiple cascading rules
The easiest way to edit your filters is via the webmail interface.
Settings there is a Menu called
Filters. You can edit your filters in this menu.
A valid filter requires:
- Filter Name
- A Condition to match
- An Action to carry out
Filters will be run in the order they are listed. Sometimes this order will matter as you can
Keep scanning after a filter matches (the default) or choose to stop when a filter matches.