[elvey]

Consider adapting and running this search (which works to search an individual mailbox via the fastmail.com web interface search box) to your service:

Search string for the emails in a table in the USDOJ's Internet Research Agency Indictment -
https://www.justice.gov/file/1035477/download :

in:* ( wemakeweather@gmail.com OR allforusa@yahoo.com OR antwan_8@yahoo.com OR xtimwaltersx@gmail.com OR unitedvetsofamerica@gmail.com OR patriototus@gmail.com OR beautifullelly@gmail.com OR staceyredneck@gmail.com OR ihatecrime1@gmail.com OR staceyredneck@gmail.com OR ihatecrime1@gmail.com OR thetaylorbrooks@aol.com OR wokeaztec@outlook.com)