Mailers+4 review
A Windows desktop tool for preparing commercial USPS mailings and postal documentation.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Mailers+4 is Window Book’s desktop application for preparing commercial USPS mailings. It is aimed at organizations with recurring production mail operations, including service bureaus and in-house mailing departments, that need presorting, address processing, postal documentation and job preparation in a Windows workflow. Supported mail classes include First-Class Mail, USPS Marketing Mail, Periodicals and Bound Printed Matter, giving it scope across several types of commercial mail rather than a single class.
Its preparation workflow covers five presort levels: 5-digit, 3-digit, AADC, mixed AADC and carrier route. Mailers+4 also processes address quality and validation, creates postal documentation and postage statements, and prepares mailing containers, labels and reports. Electronic mailing data preparation supports postal induction. Taken together, these capabilities suit mailers looking for a core desktop workflow from address processing through documented mailing preparation. Processing is manual, however, so organizations seeking automated processing should consider whether that approach fits their production needs.
The platform is Windows desktop software, which makes operating-system fit an important part of the buying decision. According to Window Book’s product page, prospective customers are directed to contact the vendor for pricing rather than selecting a published plan. Mailers+4 is a reasonable fit for small, mid-market or enterprise organizations that want the listed presort and preparation functions on Windows and are comfortable discussing pricing with the vendor. Mailers whose requirements center on automated processing, or whose workflow does not fit a Windows desktop application, should look for an alternative aligned with those needs.
Mailers+4 pros and cons
- Where it wins
- Presorts First-Class Mail, USPS Marketing Mail, Periodicals and Bound Printed Matter
- Supports address validation and five presort levels
- Prepares postal documentation, containers, labels, reports and induction data
- Where it doesn't
- Mail processing is manual rather than automated
- Runs as Windows desktop software
- Pricing requires contacting Window Book
Mailers+4 fact sheet, pricing and score →
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