Configuring Google Aliases
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.
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.
After setup, click From when composing to select your alias.

For more details, see Google's official documentation.
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