A Couple Tools to Test Email

To test email, send a help message to a mailing list server, LISTSERV@UNM.EDU, for example.  Just include the word help in the body of the message.  Another good place to send email (with anything in the subject and body) to is check-auth@verifier.port25.com.  This sends a message back with a report about your spf configuration and includes details about your original email.

Networking e-mail SMTP