With Outlook Zipper you can easily convert your e-mail attachments into a password-protected ZIP archive.
Outlook-Zipper integrates itself directly into the Outlook menu. All files attached to an e-mail can be converted into a ZIP archive with a single mouse click, without the need to call up an external program.
The passwords used can be saved in the address book and are therefore quickly reloaded for the next e-mail.
Further information can be found on the Outlook-Zipper homepage: https://outlook-zipper.com/