Information from:
From Pete Beim's [Unofficial] Eudora FAQs & Links FRAMES!
Eudora Security Alert & Bug Fix

There are also at least 4 Eudora email lists:
Eudora Email Lists
and 3 Eudora Usenet Groups:
Eudora Usenet Groups

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DUPLICATE MESSAGE IDs
Some subscribers and listowners are having problems getting posts and commands accepted .. or being recieved in duplicate:
Date sent: Tue, 23 Mar 1999 15:42:50 -0600
From: Steve Dorner sdorner@qualcomm.com
Subject: Re: Duplicate message id's

The bug has been fixed in Eudora v4.2, which is currently in (public) beta test. So, if you have a mind to use beta software, you can go to http://www.eudora.com/ and pick up the 4.2 beta which will fix the problem.

Also, we have some details on the problem. It seems to be triggered by reopening a queued or saved message and then queuing it. We believe it will not happen with a message that you edit, queue and send without first closing and reopening it. This may explain the intermittency you've been noticing.

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Eudora Lite v3.0.6
Get rid of HTMLing : This will make it so Eudora Lite discard all styles before sending any message. You'll be able to see them when you type up your message, but they will be deleted when it's sent.

1. Click on Tools: Options
2. Select the Sending Mail category
3. Uncheck the check box for "May use quoted-printable"

Eudora Lite v3.0.5 and earlier versions
Get rid of HTMLing : This will make it so Eudora discard all styles before sending any message. You'll be able to see them when you type up your message, but they will be deleted when it's sent.

1. Click on Tools: Options
2. Select the Styled Text tab
3. Check the box for "Discard styles before sending messages"
4. Click on Tools: Options
5. Select the Sending Mail category
6. Uncheck the check box for "May use quoted-printable"

Eudora 1.4.2 - 1.5.4
To Change the FROM Field: Some providers use one email address to send email and another for receiving email. You may have to change what Eudora sends as FROM or set up two subscriptions, one for sending, set to NOMAIL, and one for receiving, set to MAIL. Listserv does not seem to recognize Reply-To in messages, only the FROM field when it checks to see if the sender is authorized to send commands or posts. To change the FROM field:

1. Open the "Special" menu and select the "Settings" option
2. Go to the "Getting Started" Category on the left.
3. In the text field marked "POP account" ensure that the entry meets the following protocol: userid@domain
4. Once entered, click on OK to close the settings window. Check for new mail (CTRL M)

Eudora v4.0.2 and earlier versions
Get rid of RTF : This will make it so Eudora discard all styles before sending any message. You'll be able to see them when you type up your message, but they will be deleted when it's sent.

1. Click on Tools: Options
2. Select the Styled Text tab
3. Check the box for "Discard styles before sending messages"

MIME: Eudora automatically uses quoted printable (MIME) if your email has special charectures. to turn that off, simply turn off the QP button in the message icon bar before you send your email.

Eudora 3.0
To Change the FROM Field: Some providers use one email address to send email and another for receiving email. You may have to change what Eudora sends as FROM or set up two subscriptions, one for sending, set to NOMAIL, and one for receiving, set to MAIL. Listserv does not seem to recognize Reply-To in messages, only the FROM field when it checks to see if the sender is authorized to send commands or posts. To change the FROM field:

1. Open the "Tools" menu and select "Options"
2. Go to the "Getting Started" Category on the left.
3. In the text field marked "POP account" ensure that the entry meets the following protocol: userid@domain
4. Once entered, click on OK to close the settings window. Check for new mail (CTRL M)

To keep Eudora from sending messages with HTML tags in them:

1. Don't use any formatting (bold, underline, italics, right or center justification, font choice or size, etc) when composing the message.
   This goes for both the body of the message AND the signature; formatting in either location will cause the ENTIRE message to be sent with HTML formatting.
2. Don't insert graphics into your message or signature.
3. Don't insert horizontal lines (EDIT->INSERT->HORIZONTAL LINE) into your message or signature.
4. Go to TOOLS then to OPTIONS then to EXTRA WARNINGS and check the box labeled "WARN ME WHEN I QUEUE MESSAGES WITH STYLED TEXT"

or just:

Open TOOLS then OPTIONS then MISCELLANEOUS and select
DISCARD STYLES BEFORE SENDING MESSAGES

To Change The ">" Character When Forwarding:

1. Close Eudora
2. Open your Eudora.ini file (in the same directory as your Eudora.exe file) with a text editor such as Notepad.
3. Put in the following line in the [Settings] section: QuotePrefix=
   just like that, nothing after the =
4. Save your Eudora.ini file
5. Start up Eudora.

Viewing Full Headers: On occassion, you or your subscribers will need to view full headers - often of private email you find abusive and want to send to the sender's abuse@domain,postmaster@domain and root@domain. You won't be able to view full headers in posts to the list unless you have FULLHDR in the default-options= part of your list's header. Always send full headers when complaining about abusive, harrassing email or email spam. To View Full Headers of an email, open the message. Under the title bar are four options. The second from the left is a box which says "Blah, Blah, Blah." Click on that and all headers will be shown.

Eudora Light for Windows:
To retrieve the extended headers from an e-mail message received in Eudora Light (version 1.5.x), select Tools from the menu bar and click on Options...Having selected Options... , the Options Dialogue box will appear. From the Category list on the left, select the Fonts&Display -- you will see a series of checkbox options-- to show the extended headers described in this article, you need only make sure the Show all headers (even the ugly ones) is selected. The next time you open a new mail message the full headers should be readily available. Keep in mind, if you are like most casual e-mail readers you probably don't want to see all this techspeak mumble jumble every time your best friend writes you to see how your doing. To get back to just the basic headers, you need only to uncheck the same box. The next time you open a new message things should be right back the way they were.

Eudora Light v3.0 for Windows:
If you happen to be using the newest version of Eudora Light or Eudora Pro for Windows, showing extended headers is simply a matter of clicking the BLAH button on your incoming message's toolbar. Clicking it again will hide the extended headers.

Eudora Light for the Mac OS:
To show all headers on an incoming e-mail message in Eudora Light for the Mac OS, click the BLAH button on that message's toolbar.

Eudora 4.x
To keep Eudora 4.X from sending messages with HTML tags in them:

1. On the menu, select Tools, then Options.
2. Click Styled Text.
3. Click "Send plain text only"
4. Click OK