These commands below are an example of testing an email relay, good if you are testing relay lock down or allowance.

Using Command Prompt,

Telnet 25 or o 25


MAIL FROM: – Wait for it confirm and say sender ok – Must be external of the Exchange Server or you with have to go LOGIN AUTH



Subject: Test Email for Connectors – Hit Enter twice for it ack the Subject

This is a Test Email – BODY OF THE EMAIL

. – Ends the email and queues for Delivery – Must be by it’s self.


Hope this was helpful, please post if you have any issues or questions.