When the GFC CMLS and CTMLS merged (becoming SmartMLS) in August 2017, the decision was made to completely remove a user's ability to create a Custom Export with any Agent information. Prior to the merger, both MLSs were getting a significant number of complaints from agents that other Matrix users had been abusing the Agent Export functionality and sending way too many unsolicited/spam emails regarding their listings. The MLS is not in the business to facilitate mass emailings, so the Board of Directors decided to completely eliminate the ability to export the results of an Agent search to a spreadsheet.
Matrix users can still run searches against the SmartMLS Agent roster and see other agents' contact information (including email addresses). They just no longer have the ability to export that information into a spreadsheet for the purposes of generating mass mailings.
Users can still create other Custom Exports (by going to My Matrix> Summary> Settings> Custom Exports), but there is no longer the Agent option in the drop down list of available Export Types: