Outlook 2007 Macros: Send from non primary account if To: = …

I have multiple email accounts that I need to manage. It is important that I send emails to a contact from the correct account. Does anyone know how I might be able to check the To: field for certain criteria such as containing “@company.com”?

I am looking for a reminder that I am sending to a certain domain under the wrong email account.

Thanks in advance for any help.