• Help Sections
• • Your Pobox Addresses
  • Email Forwarding and Pobox Inbox (Mailstore)
  • Payments and Account Status
  • Spam
  • Trusted Senders
  • Account Groups
  • Personal Domains (MyPobox)
  • Filtering Mail and Autoresponses
  • Vacation Mail
  • Using Webmail
  • Common Problems and Troubleshooting
  • Passwords and Contact Information
  • How to Read Email Headers
  • Set Up Your Email Application to Use Pobox
  • User Agreements and Privacy Policy
• View Request History

How to Read Email Headers

• The Basics
  • What are email headers?
  • How can I see the headers of a message?
  • What email headers does Pobox add?
  • What are Received: headers?
• Master Class
  • The elements of a Received: header
  • Why do so many headers start with X-?
  • What is an envelope sender?
  • What is SMTP?
  • SPF, SRS rewriting and how it affects forwarding email
  • About forging Received: headers
  • How to read email timestamps (date and time entries)
• Using Headers to Troubleshoot
  • Why was this message held as spam?
  • Why wasn't this message held as spam?
  • Why did this message take so long to arrive?
  • I'm getting 2 copies of every message. Who is duplicating it?

How to Read Email Headers: View on one page (printer friendly)