[sylpheed:36439] how to set e-mail to use "Reply-To" instead of "sender"

[Globe Trotter]

Hi,
When I get e-mail from a particular sender or mailing list on sylpheed, I can not get it to reply by automatically using the "Reply-To" even if it is set up explicitly by the sender to be a different entity. I am guessing that I am missing some setting and I was wondering how do I set this up to do this correctly?
Many thanks!