I've almost completed a Exchange 2010 to 2013 migration. I've moved all mailboxes to the 2013 server and all SMTP traffic (printers, UPS, etc...) I also upgraded the Distribution lists.
Now I've suspended the "Submission" mail queue in 2010 to see what is still trying to send though 2010. (I tried to disable the transport service but then I couldn't open the mail queue when disabled, is there another way?)
There are several email enabled security groups that are still in use and email is still routing though the 2010 box.
How do I get these to use the 2013 server?