[Mailman-Users] Different From field between digest and non digest

[Graham Bentley]

Hi all,

I have just got started with mailman and have noticed that
in non digest mode subscribers recieve posts from ie in
their mail client FROM: field

listname at domain

but in digest mode from;

listname-request at domain

I would prefer the former for both but cant seem to find how 
to change this?

Thanks!