I do that. It's actually not too bad, I think the occasional missing email is overblown. At least, I don't typically have problems.
Of course, it's important to keep backups of everything (configs, logs, mail, etc), and test. Just slowly port everything over, as you gain more confidence that your not missing anything. Most email providers also will let you put a rule in place that lets you bounce mail to both addresses.
Of course, it's important to keep backups of everything (configs, logs, mail, etc), and test. Just slowly port everything over, as you gain more confidence that your not missing anything. Most email providers also will let you put a rule in place that lets you bounce mail to both addresses.