The Roundcube UI has the following options in terms of encoding file names of attachments:
Full RFC 2231 (Thunderbird) RFC 2047/2231 (MS Outlook) Full RFC 2047 (other)
In main.inc.php, the explanation is different:
// Encoding of long/non-ascii attachment names: // 0 - Full RFC 2231 compatible // 1 - RFC 2047 for 'name' and RFC 2231 for 'filename' parameter (Thunderbird's default) // 2 - Full 2047 compatible $rcmail_config['mime_param_folding'] = 0;
So what is true? Is "RFC 2047/2231" Outlook's (as the UI says) or Thunderbird's (as the config says) default? And what is the best option in terms of backwards compatibility...?
Furthermore, this really shouldn't be a user-configurable option. RFC 2047/2231 are way too complex and hard to understand for an end-user. This should be set server-side only. I'm wondering how this option could make it into the UI.