Hi Lothar, I haven't yet had the opportunity to go deep into Dovecot engineering / development, (so please correct me if necessary anyone).
I have experienced this exception where attempting to copy mailbox data within a client from IMAP account to IMAP account, but I have not had it cause a mailbox to become inaccessible. The reason was because Maildir++ format uses the "." separator to delineate child directories, and therefore the character is illegal in mailbox names. The issue was addressed by either changing the filesystem layout to LAYOUT=fs or by changing the mailbox format altogether to e.g. sdbox. > location = maildir:%%h:INDEX=%h/shared/%%u I can see from your configuration that the LAYOUT is not set as fs, so I would assume is still using Maildir++. Perhaps this setting was lost during the upgrade? Regards, Arnold Opio Oree Chief Executive Officer Parallax Digital Technologies arnoldo...@parallaxdt.com http://www.parallaxdt.com tel : +44 (0) 333 577 8587 fax : +44 (0) 20 8711 2477 Parallax Digital Technologies is a trading name of Parallax Global Limited. U.K. Co. No. 08836288 The contents of this e-mail are confidential. If you are not the intended recipient you are to delete this e-mail immediately, disregard its contents and disclose them to no other persons. -----Original Message----- From: Lothar Schilling via dovecot <dovecot@dovecot.org> Reply-To: Lothar Schilling <l...@proasyl.de> To: dovecot@dovecot.org Subject: Character not allowed in mailbox name Date: Mon, 22 Jul 2019 08:33:45 +0200 Hi everybody, after an update this morning to dovecot 2.3.7 we cannot connect to our shared mailboxes anymore. The error message as issued in Thunderbird: "Character not allowed in mailbox name '.'" I didn't change anything about the configuration. Output of dovecot -n: [...] namespace { list = children location = maildir:%%h:INDEX=%h/shared/%%u prefix = Shared/%%u/ separator = / subscriptions = yes type = shared } [...] Any help would be appreciated, thank you very much. Lothar Schilling
