poll pop3.third-party.test. with proto POP3
  user 'remote_username' there with
  password 'secret'
  is 'local_username' here
  options keep ssl

poll imap.remote-service.test. with proto IMAP
  user 'user3' there with
  password 'secret'
  is 'user3@example.test' here
  options keep ssl