For Google Workspace.

For Microsoft 365.

Question:

We have set up to except password-protected ZIP files from being zip-encrypted.
However, an email under the condition was not identified as a password-protected ZIP file.
Why does this occur?

Answer:

When you encrypt a file on your PC and attach it to an email, that might be identified as a
non-password file due to compatibility issues with your OS or ZIP client in some cases.

【Known cases】

• When you specify UTF-8 as an encode for your ZIP file name.
  *Please turn off UTF-8 encode function on your ZIP archive settings if applicable.
  
• When you zip-encrypt an entire folder on your PC and attach it to an email.
  *If you have multiple files, do not put them into a folder and please archive them with multiple file selection.
• When you zip-encrypt only 0 byte files.
  *Please archive files with at least a one byte file.