Delete temporary email addresses in Outlook created by migration process

During the migration process, a temporary email address similar to 77F1307E8532224AAB078705603838DC@exchange.utoronto.ca is created. This address may appear in your AutoComplete List/Recent Addresses in Outlook when composing a message and will cause delivery failure if used. To clear these addresses from Outlook, do the following: 

Outlook 2016 on Windows

1. Create a new email message.
2. In the To field, begin typing the address of the recipient. If you see an address like the example above, mouse over it and click on the X to the right of the address to delete it from your AutoComplete list.
   
   

Outlook 2016 on Mac

1. Create a new email message.
2. In the To field, begin typing the address of the recipient. If you see an address like the example above, click on the X to the right of the address to delete it from your Recent Addresses.