Facing an issue where you open a number of different file types in Citrix Files/Quick Edit and select "Open In" and select "Copy to Secure Mail" and you receive a "Unable to attach file" error in Secure Mail. 

Currently we have a workaround for this. We need to add all the document extensions under the File encryption exclusions list under the Secure Mail MDX policies.
> Here’s how the exclusion list should look like: \.doc$,\.docx$,\.xls$,\.xlsx$,\.csv$,\.pdf$,\.jpeg$

> After doing the above change, there's no need to re-install the app, Active poll period will take care of that.

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Problem Cause

There are some recent changes with the way Secure Mail handles the encryptions.