Release 7.4.0: Add an option to specify characters that are not allowed to be contained in a mailbox name

[Guest]

Customers need an option to specify characters that are not allowed to be contained in a mailbox name.

File 'imap.properties' is therefore enhanced by property com.openexchange.imap.invalidMailboxNameCharacters that provides a white-space-separated list of such characters surrounded by quotes; e.g.

com.openexchange.imap.invalidMailboxNameCharacters =