The great thing about the ContactMonkey tool is that we sit on top of your current Outlook or Gmail settings- this means that all of your existing distribution lists and shared mailboxes simply transfer over whenever you open up our tool.
It is still possible to put individual email addresses in the To Field and send a ContactMonkey email to them, however, there is a 500 recipient limit when using to "To" field. This also means that your compose window will look more or less the same when you send.
If you are reaching out to 500+ recipients, we strongly recommend to consider alternate methods. Instead, we recommend using a CSV or creating a distribution list for your sends. Please reach out to your account manager if you have any other questions!