InfoPath Dev

I have built a form with rules that do the following on submit:

1. Submit to SP library
2. Receive data from SP library from Created by column
3. Submit to Email (Input Created by in To: field)

The email submission works fine for all users except one.  The error states  "The form cannot be submitted because some of the e-mail addresses cannot be resolved."  http://support.microsoft.com/kb/968479  The user's display name as it appears in Outlook and SP is Perez, Anthony.  The only similar name in the directory is Perez, Anthony - 2 which may be the cause of the ambiguity.  Are there any workaround suggestions on how to successfully submit without the use of the Contact Selector, querying the active directory, or modifying the name in the active directory.  These solutions are feasible but not easily maintained by a non infopath developer in case the issue occurs with a future user.  Is there a way manually complete the To: field in the email prompt if the form fails to send?

After some tweaking and testing, I was able to resolve this problem with the following changes:

1. On open, form queries XML data connection. (XML statement is <item><name>userid1</name><value>active directory shortname</value></item>)
2. Submit to SP library
3. Receive data from SP library from Created by column.  (This field is not used in submit but is still required to populate other form fields.)
4. Submit to email where To: = value[name = StandardID] (StandardID is a field populated in the form.  Value and name are retreived from the XML on open)