Questions

Try these questions to test your knowledge from this chapter:

1. What port does SMTP operate on?
2. How do you determine which SMTP server receives mail for a given domain?
3. How do you determine which SMTP server sends mail for a given provider?
4. Why won't an SMTP server relay mail without authentication?
5. How are binary files sent as email attachments when SMTP is a text-based protocol?

The answers can be found in Appendix A, Answers to Questions.