Business Mail Guides & Direct Mail Strategies

Practical guides for sending physical mail online. Learn how to automate your mailroom, navigate USPS pricing, and send secure business letters without a printer.

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A narrow cream envelope overlaps a larger navy document envelope beside red measurement brackets and a ruler.

FIRST-CLASS MAIL · December 11, 2025

First-Class Mail Size and Weight Limits for Letters and Large Envelopes

Which business envelopes mail as letters, how many pages fit in one ounce, and what pushes an envelope into a surcharge or package prices.

Envelope on a desk beside an analog clock and mail tray.

FIRST-CLASS MAIL · December 8, 2025

First-Class Mail Delivery Time: How Long a Letter Takes

USPS delivers First-Class Mail in 1–5 days. Get the expected delivery day for your two ZIP codes, learn how USPS counts the days, and plan a letter that has a deadline.

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