What should I do when the system is neglecting the Zip file encryption rule that we have configured?

For Google Workspace.

For Microsoft 365.

Question:

We have set up for the attached ZIP files with password as to be the exception for ZIP encryption. However, the intended mails have not been judged as the ZIP file attached mail with password. What should I do when the system is neglecting the Zip file encryption rule that we have configured?

Answer:

When you encrypt the ZIP on a mail with your PC, there is a case that it might be judged as［no password］by the problem which is compatible with OS and ZIP client

【corresponding case】

• When you encrypt the entire ZIP folder with your PC, 

And If you have attached plural files onto a mail, and even if only one of them is encrypted, all the attached files should be judged as [with password].