Brahmastra Mailer
Bulk email software with API
G-Api is for teams that want API-driven Gmail campaigns instead of clicking through the Gmail UI. OAuth to Google, then campaigns, contacts, Drive, and invites. Manual Sender remains the Chrome bulk email sender when you want the inbox UI.
Not a generic SMTP API
There is no Brahmastra REST endpoint that accepts arbitrary MIME for any domain like Mailgun. If you need that, you want an ESP API. If you need Gmail’s own API at volume on a licensed PC, you want G-Api. Download from Downloads.