Unicode in mail attachement file name
If a Wt::Mail::Message contains an attachement whose file name includes unicode characters, the recipient doesn't get an attachement, but the file content in the message body :
2 0 obj
The same file will be received as a regular attachement if the file name is normalized.
Wt::Mail::Message documentation states "Recipient names, names, and body text may contain unicode text.". I suppose file names cannot yet contain unicode characters.
I wish someone can confirm this behavior.
Can Wt developers tell whether it's a frozen feature, or if it may change in the future ?
Updated by Roel Standaert over 3 years ago
It looks like we're currently just adding the filename as is, using:
Content-Disposition: attachment; filename="file.txt"
This is defined as only supporting ASCII: https://tools.ietf.org/html/rfc2183
I don't see what would prevent us from maybe making it possible to add the filename using UTF-8 encoding. This blog post seems to suggest it's not entirely straightforward, though: https://blog.nodemailer.com/2017/01/27/the-mess-that-is-attachment-filenames/
I guess it would require some testing to see what different mail clients do with the filename.