There are two ways you can monitor additional inboxes within Lavender.

Aliases are additional email addresses associated with your account. It is another identified for your primary inbox, not a separate account.

This is more common with Outlook than gmail.

To add an alias, head to Account > Aliases


This will track emails sent from those additional email addresses (allowing you to view analytics).

You can add additional mailboxes by clicking the (+) sign on the left side of you Dashboard:

If you are on a Pro or Teams plan (paid), you are able to monitor up to 4 additional mailboxes.