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http://www.exim.org/bugzilla/show_bug.cgi?id=420 Summary: An expansion operator that encodes to modified UTF-7 Product: Exim Version: 4.63 Platform: All OS/Version: All Status: NEW Keywords: work:small Severity: wishlist Priority: medium Component: String expansion AssignedTo: [EMAIL PROTECTED] ReportedBy: [EMAIL PROTECTED] QAContact: [email protected] Many (if not all) IMAP servers follow http://www.courier-mta.org/?maildir.html, which says that Maildir names on disk be encoded as modified UTF-7. The proposed operator could let users specify folder names in a more useful encoding in filters (the $address_file variable contains the argument of a save filter command; this can be transformed at will in the transport). There is one consideration to make, however. The above URL states that '/' and '.' can be BASE64-encoded as a way to escape them from being interpreted as folder or directory hierarchy separators. RFC 2060 (IMAP4rev1) expressly forbids this (unfortunately) ("Modified BASE64 MUST NOT be used to represent any printing US-ASCII character which can represent itself."), meaning that it's not possible to use both '/' and '.' as ordinary characters in folder names. Nothing prevents IMAP servers from internally encoding the one not uses as a hierarchy separator, though. Suggested specification: ${imapfolder_<sep>:<string>} The string is converted from the charset specified by the headers charset command (in a filter file) or headers_charset global option to the modified UTF-7 encoding specified by RFC 2060, with the following exception: All occurences of <sep> (which has to be a single character) are replaced with periods ("."), and all periods and slashes that aren't <sep> are BASE64 encoded. "_<sep>" can be omitted, in which case <sep> defaults to "/". Example 1: ${imapfolder:Foo/Bar} yields "Foo.Bar". Example 2: ${imapfolder_.:Foo/Bar} yields "Foo&AC8-Bar". Example 3: ${imapfolder:Räksmörgås} yields "R&AOQ-ksm&APY-rg&AOU-s". As the next step one could allow the escaping of the separator character, using a possibly specifiable escape character. -- Configure bugmail: http://www.exim.org/bugzilla/userprefs.cgi?tab=email
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