Case Study

Sending Emails You Would Actually Send: AI-Written Outreach That Works

Sarah Chen|February 13, 2026|6 min

AI-written emails have a reputation for sounding robotic. We set out to prove that an agent could write and send emails that are indistinguishable from ones written by the actual user.

The Approach

Coasty analyzed previous emails from the user to understand their writing style, common phrases, sign-off preferences, and tone. It then composed a new email that matched these patterns while addressing the specific context of the outreach.

Recipients could not tell the email was AI-written. The response rate was comparable to manually written outreach.

The goal is not to replace personal communication. It is to handle the volume of outreach that no individual has time for, while maintaining the quality that makes each message effective.

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