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You can add email addresses to the Approved and Blocked sender lists of the IMSS Spam detection settings using any of the following formats:

FormatDescriptionMatched Examples
user@example.comMatches the specified email addressuser@example.com
*@example.comMatches all email addresses in the specified domainuser1@example.com
user2@example.com
user@*.comMatches all email addresses with the specified user name and a .com top-level domainuser@example1.com
user@example2.com
user@*.example.comMatches all email addresses with the specified user name and any value before .example.comuser@x1.example.com
user@x1.y2.example.com
user@*Matches all email addresses with the specified user name in any domainuser@example1.co.uk
user@example2.net
*@*.example.comMatches all email addresses with any user name and any value before .example.comuser1@x1.example.com
user2@x1.y2.example.com

You cannot add email addresses using the following formats:

FormatDescription
*
*@*
All user names in all domains
user@example.*A wildcard in the top-level domain
*user@example.comA wildcard in the part of user name