SMTP Test

Connects to your SMTP server, shows the raw session, and confirms delivery against a disposable test address. Tests submission on 587/465 with optional STARTTLS and AUTH. Credentials are sent only to the server you specify — never logged, never stored.

Target host

Port

HELO/EHLO domain

MAIL FROM address

587/465 auto-detect STARTTLS vs. implicit TLS. Use "Other" for nonstandard ports (e.g. 2525).

Port 25 isn't available here — blocked at the platform level.

Recipient

Generated fresh when you click Run test — shown in the results below. Not editable.

Authenticate (AUTH)

Subject

Body

SMTP Test

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