Migrate e-mail server

I recently used imapsync to transfer my emails from one mail server to another, and it was so easy! All I did was:

imapsync \
  --host1 imap.migadu.com  \
  --user1 hi@ketanvijayvargiya.com \
  --password1 "foo" \
  --host2 box.ketanvijayvargiya.com \
  --user2 hi@ketanvijayvargiya.com \
  --password2 "bar"

Plus, I could migrate without downtime: I setup the new server, migrated emails and then changed my MX records. That way, my older server was fully active during the migration and I switched only once I verified the new server was fully setup.