Mail Server SSL/TLS Checker
Check SSL/TLS configuration on IMAP, POP3, and SMTP ports. Tests both direct TLS and STARTTLS connections.
This tool is provided as a best-effort diagnostic aid. Results should be verified at the authoritative source before acting on them. This check runs from our infrastructure and may log queried information to improve accuracy and availability. Logs are retained for a short period and are not used for marketing.
What This Checks
This tool tests SSL/TLS on all common mail server ports. It checks both direct TLS connections (IMAPS on 993, POP3S on 995, SMTPS on 465) and STARTTLS upgrade on plaintext ports (IMAP on 143, POP3 on 110, SMTP on 587 and 25).
For each port, it reports the TLS version, cipher suite, certificate details (issuer, subject, SANs, expiry), and whether the certificate is trusted and matches the hostname.