Bottom line, unless you are on VM List-ID= is obsolete and shouldn't be used. What I would recommend is that you just get rid of the List-ID= . If there are historical reasons for having the list available under both names, it would make more sense to set up a dummy header for the ENGINEERING-ALUMNI list with a New-List= keyword pointing to ENG-ALUMNI . Either that or rename the ENG-ALUMNI list to ENGINEERING-ALUMNI. Nathan