For tri-fold mailers, the post office has specific requirements.
The addressing (mail) panel must be located in the middle. It cannot be at the top or bottom (see provided diagram).
The top panel must then fold down first with the bottom panel then folding upward.
In this case, the page size is 8.5" x 11". If the piece bleeds (artwork to the edge), add .125" on all sides (Final size should therefore be 8.75" 11.25").
If possible, please include crop marks when exporting your PDF.
Panel E should be set at 3.625"; Panels A & F should be set to 3.6875".
Please contact us if you have questions.