Reply-Action to a mail distribution list replies to the complete list

I’m a member of a google-groups mail distribution list. Whenever I receive mail from this group, K9 tells me that it comes from the person who initiated the mail, an the sender is the group (e.g. mygroup@googlegroups.com).
When I reply to that mail, K9 simply shows a “+1” in the address field, and I need to press it on order to see where it really goes to.
Normally, I want to reply to only the person who initiated the mail - and not to the complete group.
Is there a way to configure this behavior?
Thanks, Thomas