About PostX
PostX is a Technology company based in Cupertino (United States) founded in 1994, and was acquired by IronPort Systems in November 2006. Encryption software for secure enterprise email delivery is provided. PostX has raised $16.7 million across 5 funding rounds from investors including Charles Schwab, IronPort Systems and Mayfield. Its chief executive, as recorded, is Chuck Robbins. The company was acqui-hired. Its focus areas include Enterprise Infrastructure, Cybersecurity, Email Security and Email Encryption. Its legal entity is POSTX CORPORATION. Its competitors include Skiff, BombBomb and Astro; 2 of its 3 listed competitors have raised funding.
Company details
PostX was founded in 1994 in Cupertino, United States, within the software sector. Enterprise email security was addressed through encryption tools that enabled delivery of protected messages directly to users mailboxes, bypassing the need for dedicated decryption clients. Operations centered on enhancing email gateway protections. Acquisition by IronPort occurred in 2006, leading to rebranding as PostX Secure Envelope.
- Headquarters Cupertino, United States
- Stage Acquired
- SectorsTechnology
- Website category Computers Electronics and Technology · Email
- Website postx.com
- Social LinkedIn
- Acquired by IronPort Systems (Nov 2006)
- Legal Name Postx Corporation
- Total Equity Funding$16.7M (USD)
in 5 rounds
- Latest Funding Round$5.7M (USD), Series E
Feb 2006
- InvestorsCharles Schwab
& 4 more
- Acquired byIronPort Systems
(Nov 2006)
Funding Insights of PostX
PostX has successfully raised a total of $16.7M across 5 strategic funding rounds. The most recent funding activity was a Series E round of $5.7 million completed in February 2006. This substantial capital infusion reflects strong investor confidence in the company's business model, growth potential, and market opportunities. The funding enables strategic expansion, product development, market penetration, and operational scaling to drive long-term value creation and competitive advantage.
- Total Funding $16.7M
- Total Rounds 5
- Last Round Series E — $5.7M
- First Round $11M
(Nov 2001)
- Investors Count 4
All 5 funding rounds of PostX with amounts and investors; the two latest post-money valuations are shown, the rest are part of the premium plan.
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
|---|---|---|---|---|---|
| Feb 2006 | $5.7M | Series E | – | – | – |
| Dec 2004 | $2.38M | Debt – Conventional | – | – | – |
| Aug 2003 | $4.83M | Debt – Conventional | – | – | – |
| Jun 2003 | $2.35M | Debt – Conventional | – | – | – |
| Nov 2001 | $11M | Series E | – | – |
5 investors in total: 5 institutional.
Investors in PostX
PostX has secured backing from 5 investors, including venture fund and institutional investors. Prominent investors backing the company include Charles Schwab, IronPort Systems and Mayfield.
| Investor | Description | Founded Year | Domain | Location |
|---|---|---|---|---|
Mayfield is focused on AI innovation and venture capital investments. | mayfield.com | Menlo Park, United States | ||
Early stage venture capital firm investing in the US | alloyventures.com | Palo Alto, United States | ||
Manages diversified investment portfolios across various asset classes for clients. | 1980 | sunrisecapital.com | Rancho Santa Fe, United States | |
Financial brokerage and banking services are offered to clients. | 1971 | schwab.com | El Paso, United States | |
Email and web security appliances are developed for threat protection. | 2000 | ironport.com | San Bruno, United States |
Investor details for PostX
The complete investor list, round-by-round participation and investor portfolios require an active premium plan.
- Complete investor list
- Round participation
- Investor portfolios
- Co-investor network
Verified entity values are shown only after access is granted.
People of PostX
1 people are tracked at PostX (1 in leadership).
| Name | Role | Group |
|---|---|---|
Chuck Robbins | CEO | Leadership |
Complete people profiles for PostX
Full employee and board profiles, team structure, tenure and professional contact details require an active premium plan.
- Full employee list
- Team structure
- Board tenure
- Professional contacts
Verified entity values are shown only after access is granted.
Timeline of PostX
4 dated milestones of PostX across 12 years, from founding to its latest funding, stage changes and deals.
- Founded PostX is founded.
- Funding First funding round of $11.0M.
- Funding Latest funding round, Series E, of $5.7M.
- Exit Acquired by IronPort Systems.
Competitors of PostX
PostX has 3 listed competitors in our database, 2 of them funded. They include Skiff, BombBomb and Astro.
| Company Name | Domain | Founded | HQ Location | Total funding | Employees | Description |
|---|---|---|---|---|---|---|
| skiff.com | 2020 | San Francisco, United States | $14.2M | End-to-end encrypted email services are provided by Skiff. | ||
| bombbomb.com | 2006 | Colorado Springs, United States | $2.93M | 143 | Video emails are created, sent, and tracked through the platform. | |
| getastro.com | 2015 | Palo Alto, United States | Radio broadcasting and online content services are provided to listeners. |
Detailed competitors of PostX
The full competitor set, operating metrics and side-by-side benchmarks require an active premium plan.
- Full competitor set
- Operating metrics
- Benchmarks
- Competitive positioning
Verified entity values are shown only after access is granted.
Web traffic of PostX
The website of PostX (postx.com) receives about 2K visits a month and ranks #9,743,479 among all websites worldwide, #2,666 in Email.
- Monthly visits2K
▲ 7.4% vs previous month
- Global rank#9,743,479
among all websites
- Category rank#2,666
Computers Electronics and Technology · Email
- Bounce rate45%
- Pages per visit1.2
- DevicesDesktop 19% · Mobile 81%
Websites whose visitors overlap most with PostX. Affinity shows how closely the audiences match.
| Website | Domain | Audience affinity | Monthly visits | Global rank | Profile |
|---|---|---|---|---|---|
filebottle.com | filebottle.com | 100% | – | ||
zixmail.com | zixmail.com | 100% | – | ||
centurionsoft.com | centurionsoft.com | 87% | – | ||
| cryptoheaven.com | 79% | View details | |||
| hantronix.com | 67% | #11,200,942 | View details | ||
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
All 16 similar websites and full traffic analytics for PostX
The complete similar-websites list, audience overlap and engagement analytics require an active premium plan.
- 16 similar websites
- Audience overlap
- Engagement analytics
- Traffic by brand
Verified entity values are shown only after access is granted.
Top companies in Cybersecurity & Data Protection
3 companies that operate in the same segment as PostX (Cybersecurity & Data Protection) in United States, ranked by their profile score on The Company Check.
| Company | Description | Founded | Location | Total funding | Revenue | Employees |
|---|---|---|---|---|---|---|
Cloud based website security solutions | 2009 | San Francisco, California, United States | USD 332.1 M | USD 1.67 B | 7,330 | |
Cybersecurity and zero trust solutions are delivered for secure networks. | 2007 | San Jose, California, United States | USD 148 M | USD 3.35 B | 9,616 | |
Cloud-based identity management solutions are provided for enterprises. | 2002 | Denver, Colorado, United States | USD 136.89 M | USD 36.94 M | 821 |
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Frequently Asked Questions about PostX
PostX was founded in 1994 and raised its 1st funding round 7 years after it was founded.
PostX is headquartered in Cupertino, United States. It is registered at Cupertino, California, United States.
Chuck Robbins is the CEO of PostX, as recorded in our data.
PostX is a funded company, having raised a total of $16.7M across 5 funding rounds to date. The company's 1st funding round was a Series E of $11M, raised on Nov 2001.
PostX was founded in 1994 in Cupertino, United States, within the software sector. Enterprise email security was addressed through encryption tools that enabled delivery of protected messages directly to users mailboxes, bypassing the need for dedicated decryption clients. Operations centered on enhancing email gateway protections. Acquisition by IronPort occurred in 2006, leading to rebranding as PostX Secure Envelope.
PostX has 5 investors. Key investors include Charles Schwab, IronPort Systems, Mayfield, Alloy Ventures, and Sunrise Capital.
PostX operates through Postx Corporation.
Yes. PostX was acquired by IronPort Systems in November 2006.