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 email@example.com. This sends a message back with a report about your spf configuration and includes details about your original email.
A Couple Tools to Test Email
Networking, e-mail, SMTP,