Public defender Mary French says Hudson will plead not guilty.
Prosecutors say the 29-year-old postal worker was videotaped or observed opening cards from July to December while he was employed at a Postal Service processing and distribution center in Marysville.
The indictment alleges he stole $550 from 11 pieces of mail in addition to opening numerous other envelopes.
Each charge carries a maximum five-year prison term.