Very few of our customers are using email setups between multiple East Coast VPSs, in fact I could count on one hand the number of static routes we had to setup to work around this problem. When I put problem in quotes I wasn't meaning to take away from the severity of the problem and what it could absolutely cause for business email, but I put it in quotes due to the fact that it's a problem yes, it's also by design in the way the network tunnel worked.
I just looked at ticket 417492 for you. This should be a non-issue at this point due to the tunnel no longer being active and static routes no longer being required. To add on to what was said in the ticket, it was indeed some bounces that were queued up prior to the static route being put in place for your VPS which is why you continued to receive the erroneous bounces even after the static route was setup.
The quote from Henry I believe was interpreted wrong or written poorly to reflect was was the intended statement. He was commenting on the exact migration status. He did later in that sentence explain the static route part which shows he clearly understood what the issue was and the correct resolution for it.
You're absolutely right. Any migration like this always has potential service interruption. We didn't attempt to hide any of the potential risks, but listing everything that could possibly go wrong wouldn't have served any purpose and only scared folks. There was no "crossing our fingers" involved - the migration was performed based on years of experience of our staff and administrators having done similar migrations in the past. There will almost always be a bump here or there and there were a few, but for 99% of customers they never even knew they got migrated which is exactly what we wanted. I'm terribly sorry that this did in fact impact you, however there shouldn't be any issues moving forward since the migration is done, the tunnel is no longer active, and the traffic to our east coast datacenter is now going directly to MD and not through NJ first - thus the static routes are no longer necessary at all.
I hope I've addressed all of your concerns fully. If you need anything else or have any other questions feel free to reply here or open a ticket with our support desk with Attn: Jonathan in the subject or request that it be escalated to me.