Folder subscription issue

[Egoitz Aurrekoetxea]

Good morning,

In previous thread (with the title slightly incorrect) I talk about an issue suffered some day with Sieve script and folder subscriptions. The Sieve part, was related to the migration, so for the moment let’s forget about it (for me at least) as it has never reproduced again since then.

About the folder subscription issue, I think I got something, at least a close approximation... When a user causes in mua a rename mailbox (a rename for a folder caused by a folder move in hierarchy), after the own rename, if folders were subscribed “should” (for the "plain user" at least) become subscribed in the new path. It seems that after a user rename in Cyrus the new folder is automatically subscribed (even if no subscribe command is sent by the mua). But this, does not cause in the replica (in the slave, if SUB is not sent by the client) a sync_apply_changesub() or something like entering in the “ move_subscription” condition in mboxlist_renamemailbox(), and then, the folder is properly renamed but not subscribed in the slave. I think this is what I’m suffering. Obviously, if after a rename the mua sends a subscribe too, no issue is seen. I think the problem happens when a mailbox rename happens and a SUB is not send later.

An example : 

The folder domain.com!user.parta^partb.Archives.2019.TRAFICO.CHINA.XINGANG is moved (renamed) to trash.

May 16 16:16:50 mx6c imap[83976]: conversations_rename_folder: renamed domain.com!user.parta^partb.Archives.2019.TRAFICO.CHINA.XINGANG to domain.com!user.parta^partb.Trash.XINGANG
May 16 16:16:50 mx6c imap[83976]: Rename: domain.com!user.parta^partb.Archives.2019.TRAFICO.CHINA.XINGANG -> domain.com!user.parta^partb.Trash.XINGANG
May 16 16:16:50 mx6c imap[83976]: Deleted mailbox domain.com!user.parta^partb.Archives.2019.TRAFICO.CHINA.XINGANG

In the master (sync), the folder in Trash is subscribed but in the slave it is not, and remains subscribed the folder in the original location in the “____.sub” file.

A diff between the master (replication client) .sub file and the slave’s one is (mx5 is the master, the client and 6 the slave): 

--- subscripciones-mx5c/parta.partb.sub	2019-07-10 08:47:29.000000000 +0200
+++ subscripciones-mx6c/parta.partb.sub	2019-07-10 08:48:08.000000000 +0200

+domain.com!user.parta^partb.Archives.2019.TRAFICO.CHINA.XINGANG	
-domain.com!user.parta^partb.Trash.XINGANG	

Perhaps a move_subscription to one or sync_apply_changesub should be forced in order to fix it?. I have seen issues with Outlook 2016 and Thunderbird… both mua… perhaps by RFC they should send the SUB command but… it’s the only theory I could arrive to… I have a ton more cases like this one.. Data gets properly handled but subscriptions have this issue (perhaps we could say is a mua issue but….)..

What do you think?.

Best regards,



Egoitz Aurrekoetxea
Dpto. de sistemas
944 209 470
Parque Tecnológico. Edificio 103
48170 Zamudio (Bizkaia)
egoitz at sarenet.es <mailto:undefined>
www.sarenet.es <http://www.sarenet.es/>
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