I'll fix it for MM 2.1.15. I'll add digest_footer as the last RFC1153 message in the digest. I'm not completely sure how best to do this. I.e., should it be added as a message with an empty header, or with a single, non-standard (e.g.) "Footer:" header or with a "Subject: List footer" header. I lean towards the Subject: header, because it is clearly compliant with the RFC and probably works best in an exploded digest, but the empty header is probably best in an unexploded digest.
I'll fix it for MM 2.1.15. I'll add digest_footer as the last RFC1153 message in the digest. I'm not completely sure how best to do this. I.e., should it be added as a message with an empty header, or with a single, non-standard (e.g.) "Footer:" header or with a "Subject: List footer" header. I lean towards the Subject: header, because it is clearly compliant with the RFC and probably works best in an exploded digest, but the empty header is probably best in an unexploded digest.