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Mail Flow Test

Backend required

Send an email from your server to a unique NetTools address and get a report on the route, TLS, authentication results and delivery time.

Backend integration required. Mail Flow Test needs a secured server-side service for SMTP connections and server-side processing to run safely. That service isn’t live yet, so this tool can’t run — and we won’t show simulated results.

In the meantime, try the User Agent checker or browse all tools.

How it works

You send a message from your own mail system to a one-time address. The NetTools receiving server records how it arrived and evaluates SPF, DKIM, DMARC and TLS. NetTools never sends mail to addresses you enter.

Safeguards & responsible use

  • NetTools only receives mail — it never sends to user-supplied addresses, so it cannot be used for spam or relaying.
  • Test addresses are single-use and expire; message bodies are discarded after the report is generated.
  • No mailbox credentials are requested.

Frequently asked questions

Why do I send the email instead of NetTools?

Testing your outbound path requires mail that originates from your own server. It also means NetTools can never be abused to send email.

What happens to my test message?

Only the headers needed for the report are kept, briefly. The body is discarded.