See also the FAQ: “11.4.3 How do I control what is displayed in the FOLDER INDEX screen?.
The following is concerned with Pine displaying the user’s own name, rather than the name of the recipient, in folder index listings of messages they have sent. This occurs when Pine detects the specific hostname of the computer on which it is running in the From: header. To avoid this from happening, set use-only-domain-name in Pine’s SETUP CONFIGURATION menu to Yes; this strips the name of the specific host from your From: address. Alternatively, specify your domain name in user-domain (be sure you enter it correctly, otherwise all your outgoing messages will have an invalid return address! Ask your local computing support people if in doubt). When setting either of these options, also read the help screen for quell-user-lookup-in-passwd-file to see whether you should enable that feature too.