What is the issue?
This is a description of how to create a content filter that will exclude an email from ALL but the front-line tests.
What is the solution?
Go to Content Filtering > Content Filtering and click Add....
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Complete the fields in the Add Filter dialogue box as shown in this example, but replace example@domain.com in the Value field with the email address you want to create the filter for. When using matches regular expression, you must escape any special characters by using a backslash (\) before the special character. For example, example\@domain\.com will bypass banned attachments sent from example@domain.com:
Click Save.
Further Info
For more information, see our Content Filtering and Using Regular Expression documentation.