Do not use message security features with custom forms

Outlook custom forms were not designed to support security features such as digital signatures and encryption.

If you are designing a custom mail message form, do not expect digital signature and encryption features to work in all scenarios. Microsoft does not recommend that you design a custom form solution in conjunction with message security features.

For more information about available resources and answersto commonly asked questions about Microsoft Outlook solutions, click the following article numbers to view the articles in the Microsoft Knowledge Base: