Mailers+4
Mailers+4: A Windows desktop tool for preparing commercial USPS mailings and postal documentation. Ranked #8 of 11 in Postal Presort Software by our editors (7.6/10); pricing: Pricing on request; best for windows mailers needing core commercial USPS prep.
At a glance
- Editor score7.6 / 10
- PricingPricing on request
- Best forWindows mailers needing core commercial USPS prep
- Address validationYes
- Facts checked24 Sep 2026
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
Our verdict on Mailers+4
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.
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Mailers+4 pricing
Mailers+4 fact sheet
| Free plan | Not verified |
|---|---|
| Paid from | Not verified |
| Address validation | Yes |
| Mail types | First-Class Mail; USPS Marketing Mail; Periodicals; Bound Printed Matter |
| Postal documentation | Yes |
| Presort levels | 5-digit; 3-digit; AADC; mixed AADC; carrier route |
| Supported platforms | Windows desktop |
| Automation options | Manual |
| Deployment | Desktop |
| Platforms | Windows |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Pricing on request |
| Website | windowbook.com |
| Facts checked | 24 Sep 2026 |
Alternatives to Mailers+4
- Lorton Data PresortAutomates USPS presort processing across web, desktop, command-line, and FTP workflows.8.9
- AccuZIP6A Windows desktop suite for USPS address preparation, presorting, and documentation.8.7
- ConnectRight MailerWindows software for address hygiene, USPS presorting and PostalOne! documentation.8.5
See all Mailers+4 alternatives →
Mailers+4 vs the competition
- Mailers+4 vs Lorton Data Presort
- Mailers+4 vs AccuZIP6
- Mailers+4 vs ConnectRight Mailer
- Mailers+4 vs BCC Presort
- Mailers+4 vs InsertReady Document
- Mailers+4 vs Frameworks Canada Mailing Edition
Compare Mailers+4 with any tool side by side →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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