Moving servers - copying emails
When you move sites from one server to another, you always have the issue of emails heading to both boxes while the new dns information propogates over the globe.Yes, you can drop your TTL's so this only should happen for 15 minutes, but here, in Australia, our largest Telco & ISP, has their name servers to ignore your TTL settings. It doesn't matter what you set them to, they will only update your records every 24 / 48 hours.
So at present, I can goto the old server, download mail via a POP3 client or log in via webmail, and forward the emails over to the new box.
Or, I can have the client setup two POP3 accounts on their own machines, 1 for old server, 1 for new.
But is there an easier way when you have shell access to both machines?
Can you actually copy emails from one machine to the other - sending them via ftp?
If so, how?