Letterkeel
Letterkeel: Email anyone from your Apify runs and agents
This page is a free sample. Run it on your own list: $0.001 per email sent, failures and dry runs free (1,000 emails = $1).
▶ Try it with a prefilled input

✉️ Mail merge preview

Paste your rows and a template. See every personalised email before you send it. Everything runs in your browser; nothing is uploaded or sent.

Looks right? Send it with Letterkeel: the same template, through your own SMTP, Resend, SendGrid, Mailgun or Postmark, from your domain, with delivery status per recipient. $0.001 per email; dry runs and failures free. For AI agents: https://mcp.apify.com/?tools=cybermax/send-email
Coming soon: the Letterkeel API (send email or a daily digest from your own mail account) is launching on the Apify Store; see CyberMax on Apify for the live tools.
More free from CyberMax: All free CyberMax demos & datasets · Hollerdex: How to Contact SaaS & AI Companies · Printwren: Docs Pages as PDFs