Matching To put a mailing piece together with a specific addressee - if, for example, a personalized letter needs to be matched to a specific address on an envelope. This would be done instead of affixing a live stamp. Sorting Putting mail pieces in order by zip code. To qualify as bulk mail, there must be at least 200 pieces or 50 lbs. of mail. While first class postage increases with every ounce, standard mail gives you the same low rate of postage up to 3.3087 ounces.
Delivery is slower.
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