Some of this information from:
Netscape Products & Upgrades
Netscape Patches for Bugs & Security Problems

NETSCAPE 3.X
Changing the FROM field: Some providers use one email address to send email and another for receiving email. You may have to change what Netscape sends as FROM or set up two subsciptions, 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 determining if the sender is authorized to send commands or posts. To Change the FROM field:

1. Open Netscape
2. Open OPTIONS
3. Open EDIT then MAIL/NEWS PREFERENCES then IDENTITY
4. Change the address in the YOUR EMAIL: Box

NETSCAPE 4.X
Changing the FROM field: Some providers use one email address to send email and another for receiving email. You may have to change what Netscape sends as FROM or set up two subsciptions, 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 determining if the sender is authorized to send commands or posts. To Change the FROM field:

1. Open Netscape Communicator.
2. From the tool bar select EDIT PREFERENCES.
3. From the pop-up menu select Mail & Groups
4. Under Identity, change your email address to your subscription address

To get rid of htmled text:

1. Open Netscape Communicator.
2. Open EDIT
3. Open PREFERENCES
4. Open MAIL/NEWS PREFERENCES
5. Open COMPOSTITION
6. Uncheck the box that says USE HTML COMPOSITION WINDOW
7. Make sure that "Allow 8-bit" is checked
8. Make sure that "MIME compliant" is NOT checked
9. Click OK

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 from an email, choose "OPTIONS" from the options menu bar. Listed as an option is: "Show Headers" --- then choose full headers

NETSCAPE COMMUNICATOR VERSIONS 4.5 & 4.6
Get rid of the HTMLing: The default configuration for these two versions is to send htmled emails. To change that to straight text:

1. Select "Edit" then click on "Preferences..."
2. Click on the plus sign (+) before "Mail and Groups & Messages"
3. Click on "Messages" in left pane
4. In the "Forward and Replying to Messages", change the "By default, forward messages:" to Inline.
5. In the "Send messages that use 8-bit characters", click on "As is".
6. Click on "Formatting" in left pane
7. In the section "Message formatting", click on "Use the plain text editor to compose messages"
8. In the section "When sending HTML mail messages...", click on "Ask me what to do..."
9. Click on "OK".

Get rid of "business cards" aka "address book cards aka vCards: which show up as attatchments and graphic-like code:

1. Select "Edit" then click on "Preferences..."
2. Click on the plus sign (+) before "Mail and Groups & Messages"
3. Click on "Identity" in the left pane
4. Uncheck the check box that says "Attach my personal card..."
5. Click on "OK"

NETSCAPE COMMUNICATOR VERSIONS 3.xx
Get rid of the HTMLing: The default configuration for 3.xxx is to send htmled emails. To change that to straight text:

1. Click "Tools" then click on "Mail Options"
2. Click on the "Send" tab.
3. In the "Mail Sending Format" area, click the check box next to "Plain Text"
4. Click on "Settings..."
5. In the section "Message Format", click "MIME".
6. In the check box next to "Encode text using", select "None".
7. Uncheck the check box next to "Allow 8-bit characters in headers"
8. Click on "OK"

Netscape Mail
To retrieve the extended headers from an e-mail message received in Netscape Mail (version 3.x), from the Options Menu check Show Headers | All. (You must have the Netscape Mail window open to have this option). You should see the full headers immdiately in Netscape's mail window. Keep in mind, if you are like most casual e-mail readers you probably don't want to see all this techspeak muble jumble every time your best friend writes you to see how you're doing. To return to the simple headers you are probably used to, you need only go back and check Show Headers | Normal from the same Options menu. Other versions of Netscape Mail have similar options. For example, in Netscape 2.x, you need only select Show All

Netscape Communicator's Messenger:
You can view additional information about who sent an e-mail message and how it got to you by showing the full headers. The following procedure will explain how to reveal the extended headers of an e-mail and where to send a complaint regarding spam or abuse. To show extended e-mail headers

1. Open the e-mail message.
2. Select Headers, from the View menu then All. This will show additional information that includes the return path, received from data, and the message id.

If you need to report an unsolicited or harassing e-mail, you will need to copy (CTRL-C) and paste (CTRL-V) the full headers into a new e-mail message.