I continued to investigate and I realized that in the archive the message is recorded without the X-SmarterMail-* values
A doubt arises in my mind. Is it possible that antivirus and antispam are not applied in the archive, and that some of these have removed the attachment?
Now I have another doubt regarding Microsoft Defender.
I recently added some disks and therefore some drive letters
Check that the exclusions are aligned
Sabatino Traini
Chief Information Officer
Genial s.r.l.
Martinsicuro - Italy