There is no RFC document for mail filters used in MUAs. There is currently no way
to sync mail filters through an open standard with other mail clients and mobile
devices.
I would like to be able to have groups and user specified mail filter rules in a
some sort of local or remote database that can be acceded trough an open standard,
making it possible to synchronization, read, and write mail filter rules.
I am willing to donate money for this, how much would it cost to develop this for
icedove, thunderbird and gnome evolutions as prove of concept for this possible
new standard?
PS. I am not talking about server based filtering like sieve filters[1]. But if
sieve filters can be used or enhanced then this can be an option to.
[1] http://www.ietf.org/rfc/rfc3028.txt?number=3028
As a note to this problem, I currently have program lock-in with Thunderbird.
I can not move to other mail clients without investigating large amounts of
time to get my mail filters fully working, I tried to move to claws-mail and
worked with the developer of the mail filter conversion scripts, but after months
of emailing it was still not possible to convert my Thunderbird mail filters to
claws-mail and have everything filtered the way it did with Thunderbird.
Sad story, indicating only a small portion for the need to have a standard for
mail filters and synchronization with other clients.