Question: what is the difference between bulk mail and first class mail?
Answer: First Class mail is delivered faster by the USPS than Bulk or Standard mail. ... First Class Mail can be pre-sorted to qualify for a discounted bulk mail rates, but a minimum of 500 pieces are required. Standard Mail. Bulk (Standard) mail is generally delivered by the USPS in 2-5 days locally and 1 – 4 weeks nationally.