Pricing

No accounts, no data storage, no subscriptions. The tool answers when you ask it, and it always will. Future features are in development.

Free

Available now
$0
always
  • ✓ SMTP banner reading Connect to any mail server and read its greeting banner
  • ✓ STARTTLS detection Know whether the server offers to upgrade to encrypted communication
  • ✓ Auth mechanism listing See which authentication methods the server advertises
  • ✓ Handshake timing Round-trip time from connection to first banner line
  • ✓ Server capabilities Full list of EHLO capabilities advertised by the server
  • ✓ Raw SMTP transcript Complete conversation log for manual inspection
  • ✓ All standard ports Probe ports 25 (plain), 465 (TLS), and 587 (submission)
  • ✓ No account required Nothing to sign up for, no data stored
Try the Probe

Pro

Planned
$12
/ month
  • ✓ Everything in Free
  • ⌛ Export results as PDF Download diagnostic reports for your records
  • ⌛ Custom branding on reports Add your company name and logo to exported reports
  • ⌛ Extended probe timeout Up to 30 seconds for slow or distant mail servers
  • ⌛ Concurrent probes Probe multiple servers at once and compare results
  • ⌛ API access with higher rate limits Integrate smtpprobe into your own monitoring tools
Not yet available

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