Hi Tina,
Can you please let me know your exact SmarterMail version? I'm not seeing this issue with our latest build, 15.7.6663. When I create a contact with multiple email addresses, then enter that contact's display name in the To field, I am able to see and select all of the associated email addresses. The only time I don't see all email addresses in the autocomplete list is when I type in a specific address, rather than typing in the contact's name, which would be expected.
If you're running 15.7.6663, I can help you to submit a ticket to our Support Department for a further review. If you're on an earlier version, please try and an update and let me know what you find.
Thank you!
Andrea Free
SmarterTools Inc.
877-357-6278
www.smartertools.com