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Our IMAP server (Cyrus) has been upgraded to a new version, which includes some additional features we commissioned:
- Fuzzy folder matching in delivery. When you use the + or sub-domain addressing, folders are now matched, and if not found, a fuzzy match is done. In the fuzzy match scenario, folders are compared in a case insensitive way, and with the chars "-", "_" and " " (space) all treated as the same. So if you have a folder "Mailing Lists.My List", then sending to email@example.com will get filed into that folder
- File to parent if sub-folder missing. If in the matching scenario, the sub-folder still isn't found, but a parent folder is, that folder is delivered to instead. So if you sent to firstname.lastname@example.org, the email would go into the "Mailing Lists" folder, rather than the inbox
- POP to sub-folders. If you login via POP with the username "username+foldername", then you'll be able to POP messages from that subfolder, not just inbox. This currently doesn't work for folders with spaces in the name unfortunately.
- Faster message moving/deleting. Internally cyrus now uses a "delayed expunge" mode. In small folders, this won't make much difference, but in large folders, it makes moving or deleting messages quite a bit faster.
For more information, see this discussion on the forum.