Step 1 - Login to your Brevo Account
Step 2 - Click on your profile (top right corner) and select "SMTP/API"
Step 3 - Click on "Generate new SMTP Key" and then in the pop-up that opens give a friendly name to the key and click "Generate"
Step 4 - Copy the SMTP Key that is generated and save it in notepad for now (remember this key is only displayed once so please save this securely with you). Click OK to close the dialog box
Step 5 - Now copy the settings displayed under "Your SMTP settings" into the same notepad and save the same, we will need these settings as well (SMTP Server, Port and Login id)
Step 6 - Now we have to copy over the Verified email identities (Sending identities) that you have in Brevo as we will need to use them to send the emails
Click on your profile on top right corner, and click on Sender, Domains and Dedicated IPs
Step 7 - Click on Senders to view the list of verified senders you have in Brevo
Step 8 - From the list being displayed, copy over all the email identities you wish to use to send Calendar Invites with. It's important you have these email id's added and verified in Brevo before you add them to Let's Calendar.
Now with all this information saved in notepad, we can proceed with the setup in Let's Calendar
a. SMTP Key
b. SMTP Settings
c. Sender Email Identities
Now Proceed to Part 2 -> Let's Calendar Settings