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Re:Improved Authentication for Email Encryption and Security by thelittleone on Sunday December 04, 2016 @10:09PM (#13103122)
For others interested in Gmail -> Fastmail, Fastmail also has an inbuilt IMAP migration tool:

https://www.fastmail.com/help/receive/migratemail.html

Re:Improved Authentication for Email Encryption and Security by Whitestrake on Monday December 05, 2016 @12:44AM (#13103616)
During my migration from GApps (prior to G Suite), I used this tool. I performed an initial migration before changing my MX records, then followed up a few days later with a second (partial) migration to pick up a few slackers.

I found the tool to be fast, comprehensive, and the partial migration was very effective.