Fastmail has auto-purge: https://www.fastmail.help/hc/en-us/articles/1500000280301-Setting-up-and-using-folders https://www.fastmail.help/hc/en-us/articles/1500

Fastmail has auto-purge: https://www.fastmail.help/hc/en-us/articles/1500000280301-Setting-up-and-using-folders https://www.fastmail.help/hc/en-us/articles/1500000280301-Se... > Auto-purge - Automatically delete messages after they have been in the folder for a certain amount of time, from 1 day to 1 year. Pinned messages are never deleted.