Installing Boomerang for Android and adding your email accounts
You can install Boomerang for Android from the Play Store:
Upon opening Boomerang for the first time, you will be prompted to add an email account:
Pick your account type (Gmail/Google Workspace or Microsoft/Exchange Online) and follow the onscreen instructions. You will be prompted to log in to your email provider and then grant permissions to allow Boomerang to access your mailbox. Then, after a brief tutorial you will find yourself in your Inbox.