The bat! v10 has a menu "specials->mailing list" but I can't find any option or information about it.
"Get help", "Unsubscribe", "Subscribe" will active on some mail folder. "Post message", "view archive", "Contact list owner" are always gray
As a reference:
Becky! has a "Mailing list manager" by which you can configure standard and customized commands for a mailing list
then you can set mailing list to a mail folder In which the pop up menu will show those command
"Get help", "Unsubscribe", "Subscribe" will active on some mail folder. "Post message", "view archive", "Contact list owner" are always gray
As a reference:
Becky! has a "Mailing list manager" by which you can configure standard and customized commands for a mailing list
then you can set mailing list to a mail folder In which the pop up menu will show those command