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According to TheOfficeGuide.com
Question:
What do I need to consider when shipping my envelopes?
Answer:
If your mail is a 1/4" thick or less it must meet the following requirements:
- Must be a rectangle.
- Must be at least 3-1/4" tall.
- Must be at least 5" wide.
If your envelope is smaller than 4-1/4" high and 6" wide, it must be at least .007" thick.
If your envelope is larger than 4-1/4" high and 6" wide, it must be at least .009" thick.

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