EXCHANGE   Exchange 2013 – Emails sent in TNEF winmail format



Some users notified me that some external recipients could not open sent attachments.
After some tests I realized that the problem only appeared for external contacts.

When sending this email…
Exchange 2013 TNEF Remote Domain 1

to a contact configured in the Active Directory, the Gmail web client showed this:
Exchange 2013 TNEF Remote Domain 3

The same recipient without existing in Active Directory receives the email correctly:
Exchange 2013 TNEF Remote Domain 2

My users notified that … Read more