Free · runs in your browser
STARTTLS Probe
Confirm STARTTLS is offered and works.
How it works
STARTTLS Probe
Confirm STARTTLS is offered and works. Runs in your browser — you can email the result.
Results appear here after you click Run.
Ready to send from your product? MailShrine Developer API uses the same DNS, webhooks, and SMTP patterns this tool inspects.