Both sides released numerous television and radio advertisements, as well as mailers to registered Republicans. Billboards and mailers about train safety will also be put out to raise awareness. This spending included television ads, mailers, and consulting services. Scenarios like compromised systems and shared sending mailers limit this use. His campaign stated that "unethical, dishonest" Democratic mailers against him actually backfired and were beneficial. He also sent out mailers carrying the same message. The Mailers would later join the Teamsters; the Printers would not. This system also generates weekly and monthly notification mailers, for its registered users. It is primarily only used by business mailers. The International Mailers Union was refused membership. This generally includes headhunting, HTML mailers, referral follow-ups, etc. Two such standards became common, "WaZOO" and "Bark", which saw varying support among different mailers. The company is a member of the American Catalog Mailers Association. In New York City, Typographical #6 and Mailers, M-6. This was particularly true of older mailers.