1. Mail that includes letters and postcards and packages sealed against inspection
   - first class, first-class mail, 1st-class mail

Type of: mail

• distraught
• distress
• distress call
• distress signal
• distressed
• distressful
• distressfully
• distressfulness
• distressing
• distressingly
• distressingness
• distributary
• distribute
• distributed
• distributed data processing
• distributed fire
• distributer
• distribution
• distribution agreement
• distribution channel
• distribution cost
• distribution free statistic
• distribution law
• distribution list
• distributional