Same story, different cloud. I spent years building my reputation as a trusted sender IP, until the entire swath of EC2 addresses was flagged by blacklists. It’s extra work to send outbound through SES, but they have excellent controls.
You may find that RSYNC is slow like crazy, and your time would be better spent halting services, making one last backup, and FTP’ing (or secure) the bundle across to your new machine. I found that RSYNC can be slower than all of that.
Good luck with it all!