Greetings,
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Since you asked Qwest to close your account, they most likely deleted the q.com email address so the undeliverable message is expected in that case. Please make sure that your contacts have your new msn.com email address.
As your friends and associates are receiving undeliverable messages when sending to your new @msn.com email address, then try the below mentioned steps:
Things to do: To remove email forwarding:
Sign into hotmail website by visiting http://www.hotmail.com/ > Click Hotmail Inbox > Click options at the top right hand corner > click more options > Under Managing your account > Click Email Forwarding > Make sure to check Don’t Forward and then click Save.
Let us know the outcome.
Thanks!