Configuring Google Aliases
Set up Google Workspace aliases to send from multiple addresses in Missive.
In order for Gmail to use the aliases you set on Missive, you will also need to set them on Gmail.
Adding an alias only on Missive isn't enough for Gmail to validate that you can indeed use that address and that you're not using an address from a domain that you don't own. Without setting them up on Gmail as well, recipients will see and reply to the default email account address.
Add the alias in Google Admin (Google Workspace only)
If you're using Google Workspace, an admin must first create the alias:
Sign in to Admin console
Go to the Google Admin console with an administrator account.
Open user settings
Navigate to Menu > Directory > Users and click the user's name.
Add the alias
Under the user's name on the left, click Add Alternate Emails, enter the alias name (the part before @), and click Save.
You can add up to 30 email aliases per user at no extra cost.
Set up "Send mail as" in Gmail
Once the alias exists, configure Gmail to send from it:
Open Gmail settings
Open Gmail, click Settings (gear icon) > See all settings.
Add the alias address
Go to the Accounts and Import tab. In the Send mail as section, click Add another email address.
Configure and verify
Enter your name and the alias address, check Treat as an alias, then click Next Step and complete the verification.
After setup, click From when composing to select your alias.

For more details, see Google's official documentation.
If you skip this Gmail setup, Missive will show an error on outgoing emails:
"From" address reverted
Gmail changed alias@example.com to you@example.com in the outgoing email. You must define alias@example.com as an alias in your Gmail settings.
Go back through the steps above to add the alias in Gmail.
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