ManageSieve Client Issues
The TLS problem:
The core of the TLS problem is that a ManageSieve server is required to send an unsolicited CAPABILITY response right after successful TLS negotiation. Older Cyrus servers did not do this and many clients incorporated this protocol error as the standard, meaning that these do not expect the CAPABILITY response and thus fail with subsequent commands. However, now that Cyrus' Timsieved has changed its behaviour towards protocol compliance, all those clients will follow eventually. The following clients are known to have this TLS issue:
- Thunderbird Sieve add-on
- TLS broken for old versions. Starting with version 0.1.5 the Thunderbird Sieve add-on properly supports TLS.
- KMail + kio_sieve
- TLS broken for old versions. This issue is fixed at least in kmail 1.9.9 / kde 3.5.9.
For some users the !Avelsieve client stores scripts but fails to retrieve them later. This problem is directly caused by AvelSieve's TLS support. A quick way to fix this is not to enable TLS for ManageSieve. AvelSieve stable (v1.0.1) does not have TLS support at all, so you will see this happen only with the development or SVN versions. Another issue is that (at least with avelsieve-1.9.7) it is impossible to delete the last rule of a script. For avelsieve-1.9.7 you find a patch that fixes these two issues here.
These clients are specifically written for Cyrus timsieved and fail on multiple stages of the protocol when connected to Dovecot ManageSieve.
(Stephan Bosch): I intend to look at these in the future, but currently these are very much unavailable for use with Dovecot. But, feel free to fix these yourself
(Steffen "Stefreak" Neubauer): I've fixed the problems for smartsieve. Just replace your lib/Managesieve.php with this here: https://www.commail.org/sieve/lib/Managesieve.phps - HAVE FUN!
(Mark Titorenko): Stephan provides an updated link to Steffen's Managesieve patch in this Dovecot mailing list post dated 2009-09-01
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