You can edit or add a new message stamp. Stamps are inserted into messages when they trigger the rule. Typically they contain some standard confidentiality statement or a similar block of text. Rule Tokens/Variables (for example, the name of an attached file) can also be included in the text.
To edit or add a new message stamp:
Hosted Email Security recognizes messages signed using the S/MIME standard.
The Microsoft TNEF format is used when sending rich text email using the Outlook client. If Hosted Email Security tries to insert a stamp into a TNEF-formatted email, the message might become corrupted or unreadable. To prevent this, if your organization uses Outlook to send rich text formatted messages, Hosted Email Security enables you to exempt TNEF messages from those actions that might corrupt the message.