Insights

Acquisition Target Postbox recently became part of eM Client Inc through a full acquisition, indicating potential strategic alignment in enterprise messaging solutions and a need to unify or integrate client-side email workflows with broader productivity tools.

SMB Focus With a small team size (2-10 employees) and revenue under 1M, Postbox operates like a lean SMB software business that may be seeking scalable email productivity enhancements, security features, and affordable licensing suitable for growing teams.

Privacy Emphasis Postbox highlights strong privacy stance, does not read or store emails or passwords, and supports encryption experiments through OpenPGP, signaling a potential upsell to advanced security, compliance workflows, and enterprise-grade privacy features.

Productivity Upsell The product offers macros, pre-canned responses, sharable file links, and rich composition tools, presenting opportunities to upsell workflow automation, collaboration features, integration add-ons, and premium templates for larger organizations or MSPs.

Expansion & Partnerships Recent news shows an acquisition by eM Client, plus a history of Mac-focused evolution and Labs experiments, suggesting opportunities around cross-promotion, channel partnerships, and joint marketing to penetrate broader email client ecosystems.

Similar companies to Postbox

Postbox Tech Stack

Postbox uses 8 technology products and services including Crazy Egg, Hotjar, Mixpanel, and more. Explore Postbox's tech stack below.

Postbox's Email Address Formats

Postbox uses at least 1 email format:
Postbox Email FormatsExamplePercentage
First@postbox-inc.comJohn@postbox-inc.com
100%

Frequently Asked Questions

What is Postbox's phone number?

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You can contact Postbox's main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is Postbox's official website and social media links?

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Postbox's official website is postbox-inc.com and has social profiles on LinkedIn.

How much revenue does Postbox generate?

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As of August 2026, Postbox's annual revenue is estimated to be <$1M.

What is Postbox's SIC code and NAICS code?

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Postbox's SIC code is 7372 - Prepackaged Software and NAICS code is 5112 - Software Publishers.

How many employees does Postbox have currently?

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As of August 2026, Postbox has approximately 5 employees across 3 continents, including Asia, Europe and North America. Key team members include Partner: V. H. Explore Postbox's employee directory with LeadIQ.

What industry does Postbox belong to?

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Postbox operates in the Software Development industry.

What technology does Postbox use?

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Postbox's tech stack includes Crazy Egg, Hotjar, Mixpanel, Amazon Web Services, CookieYes, Google Workspace, Mailchimp and New Relic.

What is Postbox's email format?

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Postbox's email format typically follows the pattern of First@postbox-inc.com. Find more Postbox email formats with LeadIQ.

When was Postbox founded?

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Postbox was founded in 2007.
Postbox logo

Postbox

Software DevelopmentCalifornia, United States2-10 Employees

Postbox is a software development company that provides a desktop email client aimed at boosting productivity and speed. It combines straightforward usability with features to manage large inbox workloads, including advanced search, macros, tagging, and extensive keyboard shortcuts. The client supports professional email creation with pre-canned responses, content blocks, and signatures, and enables fast large-file sharing through links from cloud services, and it runs on macOS and Windows. Based in San Carlos, California, the company operates as a small firm that prioritizes privacy, not reading or storing emails or passwords, and not serving ads or sharing user data with third parties. In October 2024, Postbox was acquired by eM Client, Inc., marking a notable development in its corporate status.

Section iconCompany Overview

Phone number
SIC Code
7372 - Prepackaged Software
NAICS Code
5112 - Software Publishers
Founded
2007
Employees
2-10

Section iconFunding & Financials

  • <$1M

    Postbox's revenue is estimated to be in the range of <$1M

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