Every content item in this list is tagged with all the required labels:

• attach-file
• block-sender
• excel-file
• exchange
• exporting
• howto
• list-serv
• mail-app
• send-block
• text-code

To add a label to the list of required labels, choose '+ labelname' from Related Labels.
To remove a label from the required labels, choose '- labelname' from above.