add sieve support for Thunderbird

[usul]

Would be nice to be able to edit sieve filters from within Thunderbird.

[Jon]

Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.

[Jivay]

Rooting for this idea since the recommended plugin doesn't seem to be working any more on current versions of Thunderbird.

[valheru]

I would love to have this!

[HecateRaven]

I want it too

[JeffInTx]

Another vote for yes!

[Timbudong]

I upvote too!

[Miesiu]

There was good idea to add calendar.  Now time for sieve scripts:

1.) autoresponder

2.) filter/move mails on the server side

[mike217]

Having Thunderbird to support the Sieve protocol would be really great to see!

[usul]

There's an old bugzilla issue with a very old POC at https://bugzilla.mozilla.org/show_bug.cgi?id=79525