ContactMonkey does not support sending emails to Outlook Contact Groups. Use distribution lists, CSV uploads, or ContactMonkey contact lists instead.
Note: Outlook Contact Groups are different from List Management contact lists. The latter works seamlessly with all ContactMonkey features.
Why Contact Groups Don't Work
ContactMonkey requires all recipients in the To field to have an email address. Contact groups don't have an email address—they're just containers for other email addresses. When you add a contact group to the To field, ContactMonkey cannot process it.
If you try to count recipients or send to a contact group, you'll see these error messages:
An unknown error occurred while counting recipientsAn unknown error occurred while sending your mail merge
These errors occur with all tracking options (Overall, Anonymous, and Individual).
Recommended Alternatives
Use one of these methods instead of Outlook Contact Groups: