Reduce undeliverable mail and lower postage costs with MAILERS+4. This easy-to-use postal presort and mail compliance software is CASS and PAVE certified to first verify addresses in your list and then presort your mailings for maximum discounts for First Class, Standard, and Periodicals mail. MAILERS+4 can also identify and update the addresses of movers in your list, as well as identify duplicate records. Intelligent Mail barcode support. Request a free trial today.