We recently migrated from Exchange 2007 to 2013.
We have several multi-function scanners that we use for scan to email functions. We have a recieve connector setup for internal use.
When that recieve connector is setup to require SMTP authentication by un-checking "Anonymous Users" under "Permission Group" and specifying a valid AD user account the emails get sent but the attachments seem to be embedded in the email as binary instead of being attached.
If we disable SMTP authentication on the scanner and check "Anonymous Users" attachments work as expected.
Any idea what would cause something like that?