[Mailman-Users] Solution to my 550 user not found problem..

My Problem: 550 user not found errors, aliases database are setup correctly but still mailman wont work? all mail to lists fails with 550 I read everything i could find for 2 weeks and found no helpful solutions posted anywhere online nor could i get help on any of the lists, this one included

[Mailman-Users] all mail to lists generates 550 user not found error

I am missing something here and would totally appreciate anything anyone could point out that i am obviously not seeing or flat out doing incorrectly. I cannot reply to the confirmation emails coming from my installation of Mailman or send mail into to any of my "test" lists. I/everyone get an