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How to Add Custom Headers to Emails in Eudora

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Email Text and Email Envelopes

An email is more than just the text, the pictures and the attachments. It also has an envelope. (Technically, an email message even has two: an extra envelope is wrapped around the envelope that concerns us here.)

The envelope contains information you see when you open the message, and information you see in the mailbox summary, too. The sender's name and address, the message date and the subject are part of the email envelope — or header, for example.

You Can Add New Invisible Elements

Next to these visible elements, the header also contains lots of information not normally displayed. Routing and filtering information belongs to this group, as do custom X-headers.

Yes, you can add arbitrary information to the header part of emails you send in Eudora. The information must be in the format X-{field name}: {data}, and you should keep in mind that recipients will not normally see it. If somebody does look at the source of your message, they may see "X-my-haiku: a short line / the head sees itself not / spotted right now", though.

Add Custom Headers to Emails in Eudora

To insert custom header lines in the emails you send with Eudora:

  • Edit the ExtraHeaders X-Eudora option.
  • Type the desired custom header in its entirety.
    • Enter "X-my-haiku: a short line / the head sees itself not / spotted right now", for example.
    • Separate multiple header lines with "\r\n" as in "X-URL: http://email.about.com/\r\nX-my-haiku: a short line / the head sees itself not / spotted right now".

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