What 33Mail does

33Mail is a privacy-focused email alias and forwarding service founded in August 2010 in Dublin by brothers Ian and Andrew Clarke. Users are assigned a personal subdomain (e.g., user.33mail.com) and can create unlimited aliases on the fly; mail sent to those aliases is forwarded to the user's real inbox, and unwanted senders can be blocked with a single click. The platform also supports anonymous replying via 33Mail's servers, custom domain MX routing for paid tiers, 2-factor authentication, and integrates with Google Workspace as a catchall. A Chrome extension auto-fills 33Mail aliases on web signup forms, lowering onboarding friction.

The go-to-market is product-led and self-serve: a free Lite tier lets users experience the core value before upgrading to Premium ($1/month, originally $12/year), Pro ($5/month, originally $60/year), or Enterprise ($50/month), with revenue supplemented by unobtrusive advertising on free forwards and a referral program. The company has been bootstrapped and reportedly profitable from its earliest days, with no external funding. The same founders have launched adjacent products — EmailEngine.io (2019) for domain-based forwarding and PopRelay (Feb 2026) to replace Gmail's discontinued POP3 fetching — which broaden the product surface beyond consumer aliasing. No revenue, headcount, or named enterprise customers are disclosed; the company serves 500,000+ users and processes over 4 million emails per month.

Name

33Mail

Website

https://33mail.com

Company type

Private

Founded year

2010

Operating status

Operating

Headcount range

1–10 employees

Short description

33Mail is a bootstrapped, Dublin-based email alias and forwarding service founded in 2010 by the Clarke brothers, offering unlimited private aliases, anonymous reply, and custom domain support to 500,000+ privacy-conscious consumers and small businesses worldwide.

Ownership category

akta.pro rank

Product category

Email Privacy and Alias Forwarding Services

NAICS

Private Mail Centers (561431)

SIC

Telegraph & Other Message Communications (4822)

akta.pro primary industry

Email Authentication & Domain Protection (DMARC/SPF/DKIM) (HDADAKAC)

akta.pro secondary industry

Collaboration Account Takeover & Session Protection (HDADAKAH)

Keywords

• Email alias forwarding
• Email privacy service
• Disposable email addresses
• Spam prevention
• Custom domain email

Headquarters

HQ city

Dublin

HQ country

Ireland

HQ region

Europe

Markets served

GTM type

B2C

Offering type

Software

Cost components

Infrastructure, Technology or R&D, Personnel, Operations

Revenue model

1. Freemium Subscription Tiers: Basic service is free with generous bandwidth limits. Premium tier ($1/month) offers additional features like custom domains, increased bandwidth, and anonymous reply limits. Pro tier ($5/month) targets power users with higher limits and more custom domains. Enterprise tier ($50/month) offers unlimited custom domains and maximum bandwidth.
2. Referral Program: Users can earn free premium by referring friends (originally required 5 referrals, reduced to 2 referrals for free year of Premium).
3. Advertising: The ToS states they may add short unobtrusive advertising, clearly identified as such, to emails forwarded to Lite users. Premium and Pro users get no ads.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels5 records

Core offering

33Mail provides unlimited free private email aliases that forward to a user's real email inbox. Users receive a personalized subdomain (username.33mail.com) and can create unlimited disposable aliases for online signups, block unwanted senders with a single click, and reply anonymously to forwarded emails. Paid tiers add custom domain support, higher bandwidth limits, and increased anonymous reply capacity.

Product overview

33Mail is an email alias and privacy-focused email forwarding service that provides users with unlimited private email addresses. The core offering is the 33Mail service itself (available in free, Premium, Pro, and Enterprise tiers), which forwards all mail sent to user-created aliases to the user's real inbox while allowing blocking of unwanted senders. The company also operates related email tools: PopRelay, which replaces Gmail's removed POP3 fetching by importing POP3 mail into Gmail via the Gmail API; and EmailEngine.io, a domain-based email forwarding service for businesses. A Chrome browser extension provides convenient alias creation directly from web forms. The service was founded in 2010 by brothers Ian and Andrew Clarke and handles over 4 million emails per month.

Differentiator

Problem solved

Functional benefit

Products and services

• 33Mail Core Service Email alias and forwarding service that provides unlimited private email addresses forwarding to a user's real inbox. Users receive a personalized subdomain (username.33mail.com), create unlimited aliases for online signups, block unwanted senders with one click, and reply anonymously.
• 33Mail Premium Paid subscription tier priced at $1 per month with 50MB monthly bandwidth, 20 anonymous replies per day, 1 custom domain, 1 additional username, unlimited aliases, and ad-free experience.
• 33Mail Pro Power-user subscription tier priced at $5 per month with 500MB monthly bandwidth, 100 anonymous replies per day, up to 5 custom domains, and 5 additional usernames.
• 33Mail Enterprise

Quantifiable outcome

• 500,000+ users served since 2011
• +3 more outcomes

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration6 records

Feature7 records

Partnerships

One partnership is on record.

• PopRelayminorStrategic or Co-development Partner · 15 February 2026PopRelay is a related service built by the same team that created 33Mail. It addresses the gap left when Google removed POP3 fetching from Gmail in early 2026. PopRelay connects to POP3 servers and imports messages into Gmail via API, providing the same functionality Gmail discontinued. Both services are operated by the same founding team.

Scale indicators4 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• Fastmail: Independent paid email provider offering masked email functionality and custom domain hosting. Adjacent to 33Mail's EmailEngine.io offering for business domains while competing in the broader privacy-focused email space.
• Proton Mail: End-to-end encrypted email provider whose acquisition of SimpleLogin gives it an integrated email aliasing offering. Competes with 33Mail's privacy positioning and bundles aliases with a larger secure-mail platform.
• Apple Hide My Email: Apple's built-in email aliasing feature available to iCloud+ subscribers. Provides unlimited random email addresses that forward to a real inbox — directly overlapping with 33Mail's core offering but bundled free with Apple's ecosystem.

Direct peers

• DuckDuckGo Email Protection: DuckDuckGo's free email aliasing service that strips trackers and forwards mail through a personal Duck Address. Comparable to 33Mail in targeting privacy-conscious consumers and offering free individual plans.
• SimpleLogin: Email aliasing service offering unlimited aliases, custom domain support, and anonymous replies — directly comparable to 33Mail's core feature set. Now owned by Proton, giving it broader distribution but similar end-user functionality.
• Spamgourmet: One of the oldest disposable email alias services, offering self-destructing and forwarded email addresses. Functionally similar to 33Mail with the same disposable-alias use case, though with a more dated UI.
• Burner Mail: Email alias and forwarding service offering custom domains, browser extensions, and multi-recipient forwarding. Functionally overlapping with 33Mail's core product for individual privacy-conscious users.
• Ironvest (formerly Abine Blur): Privacy service offering masked emails, masked phone numbers, and masked credit cards. Directly comparable to 33Mail's email aliasing functionality and serves a similar privacy-focused individual and SMB customer base.
• Addy.io (formerly AnonAddy): Open-source email aliasing service supporting unlimited aliases, custom domains, and PGP encryption. Targets the same privacy-focused individual and developer audience as 33Mail with a comparable freemium tier structure.
• Mozilla Firefox Relay: Mozilla's free email alias service that creates masked email addresses forwarding to a real inbox. Targets the same privacy-conscious individual user base as 33Mail and offers premium tiers for custom domains and unlimited aliases.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/33mail
• LinkedInlinkedin.com/company/miller-county-board-of-education

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about 33Mail