To put limits on file names for incoming email attachments, you can use the Filenames ruleset in a POP3-Server proxy action. Or, you can use the ruleset for the POP3-Client proxy action to put limits on file names for outgoing email attachments. You can add, delete, or modify rules.
If you modified a predefined proxy action, when you save the changes you are prompted to clone (copy) your settings to a new action.
For more information on predefined proxy actions, see About Proxy Actions.
Use Predefined Content Types