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As of January 2021 we now offer mail filtering via SIEVE filters.
This page is not an in depth overview of how SIEVE works or how to write filters in it. What we will do is give a basic overview and detail how SIEVE is configured here.
First, you may use any SIEVE Management client that an properly connect to Bardicgrove. If you are using Thunderbird then go to your add-ons manager and search for Sieve. At this writing this is by far one of the best ways that we have found to manage SIEVE filters as it has a good GUI filter builder and also lets you get to the filter code.
If your mail program does not have a way to manage SIEVE filters, then you may use the webmail system that we manage to get to and manage your filters.
Sieve filters can only have one active filter at a time. By default, if you have not configured any filters then you will have the system wide default filter. It is named 'roundcube' and will be active anytime you do not have a different filter specified as your active filter.
You may edit the 'roundcube' filter, doing so will save a personalized version of it for your account. You may also creat and active your own primary filter if you would like.
If you make edits to the default system filter and would like to revert to what we offer by default, simply delete your version and the system version will come back (even if it isn't your active filter)
By default the systemwide filter executes a global filter called SpamToJunk which will move any mail that gets flagged as spam to a Junk folder in your account. If the folder does not exist, it will automatically be created. For those wondering, mail gets marked as SPAM at a SpamAssassin score of 5 or more and we outright reject any mail that scores at 15 or higher.
Additional filters may be added simply by adding a new script. They can then be included in your active script in whatever order you feel is correct.
Further reading on example mail filters can can be seen at Pigeonhole/Sieve/Examples