I have a user who routinely receives PDF files in email. She double-clicks the attachment and it opens in Acrobat DC. Once opened, she marks the file up, then selects "File + Send File+Attach to Email". The first time she does this, it works as expected. The second and any subsequent attempts fail. Outlook then prompts for username and password which never is accepted and Acrobat displays the error "An error occurred while sending mail.". Then Outlook becomes "Disconnected".
This is in a Citrix XenApp Desktop environment and I cannot recreate this outside of the Citrix environment. This does not happen on any of our desktop computers, only in the Citrix environment. Acrobat Reader seems to work just fine. I'm able to recreate this at will regardless of which user I test with. Any guidance would be greatly appreciated.