How do I check my mail server's SSL?

Enter your mail server's hostname and port (e.g., smtp.gmail.com port 587) into our checker to verify its SSL/TLS configuration and certificate validity.

STARTTLS is a protocol command that tells an email server that the email client wants to upgrade an existing insecure connection to a secure one using SSL/TLS.

📧 SMTP/IMAP SSL Checker

Mail SSL Checker — Free SMTP, IMAP & POP3 SSL Security Test

Test SSL/TLS security on mail servers. Support for SMTP (587/465), IMAP (993), and POP3. Verify STARTTLS and certificate validity.

Check Mail Server SSL

Hostname:

Port:

Protocol:

Common Mail Server Ports

SMTP: Port 587 (STARTTLS) or 465 (SSL/TLS)
IMAP: Port 993 (SSL/TLS) or 143 (STARTTLS)
POP3: Port 995 (SSL/TLS) or 110 (STARTTLS)

Popular Mail Servers:

Gmail: smtp.gmail.com (587), imap.gmail.com (993)
Outlook: smtp-mail.outlook.com (587), outlook.office365.com (993)
Yahoo: smtp.mail.yahoo.com (587), imap.mail.yahoo.com (993)

Mail SSL Checker — Free SMTP, IMAP & POP3 SSL Security Test

Check Mail Server SSL

Common Mail Server Ports

Popular Mail Servers:

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