Mailmeteor

Mailmeteor is a Gmail extension that adds AI writing straight into your inbox. Give it a topic or prompt and it generates complete email drafts with subject lines and body text. The tool works within Gmail's interface, so you skip the back-and-forth between tools.

It's a lightweight pick for Gmail users who send lots of email but don't need a full marketing platform. You'll find it simpler and faster than switching to a separate tool, though it lacks features like A/B testing or detailed campaign analytics.