SmarterMail Enterprise Build 7914 (Sep 1, 2021)
Never seen this before, we have two users, Alex and Aaron on the same domain. It looks like Alex is sending contacts and it's breaking both MAPI and Webmail, but not when using Outlook with IMAP.
Alex is sending with Outlook on normal SMTP with attachments in Outlook to Aaron who is using Outlook with MAPI. When Aaron opens the emails it show blank with 2 attachments both titled Untitled Attachment.
1st just a text file with "This attachment is a MAPI 1.0 embedded message and is not supported by this mail system."
2nd seems to be the contact possibly in RTF.
I tested with my webmail and Outlook 2019 on MAPI with the same results, but a seperate account with just checking with IMAP works fine.
It only happens when you click Outlook Item as attachment, using a Business Card (vcf) seems to work fine.