$ mail --version mail (GNU Mailutils) 3.10-11 [release-3.10-11-g3cab87f05] command:
$ mail -s Hello -E "set sendmail=\"sendmail:/home/admin/bin/sendmail\"" --alternative --content-name HTML --content-type=text/html -A /dev/shm/html-file --content-name TEXT --content-type=text/plain s...@example.com < text mutt: I 1 <no description> [multipa/alternativ, 7bit, 31K] I 2 ├─><no description> [text/plain, 7bit, utf-8, 0.1K] I 3 └─>HTML [text/html, base64, utf-8, 31K] With this version I can the name for HTML part. Name is missing for TEXT part. But I remember it worked once in earlier version, now I am confused. Should it work if text part is taken from standard input? Jean