Question about Sender

I can't tell you how many people try to send a message to a list and screw 
it up because they send to listname-owner instead of to listname.

Every message they receive from the list has this header:

Sender: [email protected]

Also, I saw this setting

# sender (level 1)
# The sender configuration setting contains an e-mail address which is
# used internally by Majordomo when informational documents, confirmation
# instructions, and other notices are mailed in response to a Majordomo
# command or a posted message.
configset frambors sender = $LIST-owner

I realize that there are a number of broken mailers out there that don't 
use From and instead use Sender instead when figuring out who a Reply 
should go to. Does the sender setting above help or is that also going to 
impact every other time that an automatic message gets sent? I don't want 
to use ReplyTo. Or, is there some way to cause the Sender header to have 
the listname if it's a message from the list?

TIA

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