On 19.9.2012, at 13.36, Charles Marcus wrote: > On 2012-09-19 5:14 AM, Timo Sirainen <t...@iki.fi> wrote: >> It's an invalid mailbox name and you can't access it using doveadm. Either >> rename it with "mv" or via IMAP protocol (not entirely sure if it works via >> IMAP either). > > Just for clarification... it is invalid because of the '&' character? Is > there a list of dovecot (or is this simply the IMAP protocol in general?) > considers invalid characters in folder names somewhere?
mUTF7 uses the & character for encoding non-ASCII data. The & character is encoded in mUTF7 as "&-". Dovecot nowadays uses UTF8 internally for all mailbox names, and it's simply not possible to create from UTF8 string a valid mUTF7 string that contains & alone. Dovecot has also some additional restrictions on characters (mainly control chars), but they are only enforced when creating new mailboxes. Opening existing mailboxes with control chars is allowed.
