Revise voter list maintenance procedures to apply to permanent address changes

SB 499 updates Montana's voter list maintenance rules to specifically require election administrators to verify permanent address changes (not temporary ones) using U.S. Postal Service data. It mandates sending address confirmation notices to voters who've changed their permanent address and moving non-responsive voters to an inactive list after 30 days. This affects voters who move permanently but don't update their address with the U.S. Postal Service, particularly those receiving absentee ballots. The bill also requires biennial address confirmations for absentee ballot voters to continue receiving ballots at their updated permanent address.