SMTP
SMTP.com is a cloud-based email relay and transactional email API provider serving 100,000+ businesses globally, processing billions of emails monthly with a self-reported 98% delivery rate, operating as the delivery backbone within Ziff Davis's Martech Division.
- Company typePrivate
- Founded2003
- HeadquartersWoburn, United States
- Headcount51–100
- GTM typeB2B
- OfferingSoftware
What SMTP does
SMTP.com operates a cloud-based email relay and transactional email platform serving more than 100,000 businesses globally and processing billions of email messages per month. Its core technology is a private-cloud SMTP relay architecture combined with a RESTful JSON Email API (v4) supporting multiple authentication methods, dedicated IP pools, hybrid IP options, and a self-reported 90-day analytics retention window that materially exceeds the 3-7 day retention typical among peers. Differentiated modules include Reputation Defender (real-time email list hygiene to suppress invalid addresses pre-send and protect IP reputation) and Insight Engine (launched July 2025, a data-enrichment add-on for enhanced customer profiling).
The company monetizes through a tiered subscription model — $25/month for 50,000 emails, scaling to $500/month for 1 million emails — with usage-based overage charges set at 1.25x pro-rated pricing, plus recurring add-on fees for dedicated IPs (from $80/month), Reputation Defender, and Insight Engine. Go-to-market is hybrid: API-first product-led onboarding for self-serve developers and SMBs at registration.smtp.com, complemented by an inside sales team for enterprise and high-volume senders requiring custom quoting, dedicated account management, and tailored IP-warming plans. Distribution includes integrated plugins for Shopify, WordPress, and Zapier, a partner/affiliate program, and a global office footprint spanning New York (headquarters), Ottawa, Newcastle upon Tyne, Kiev, and Odessa.
SMTP is wholly-owned by Ziff Davis, Inc. (formerly J2 Global) and operates inside the parent's Martech Division alongside affiliated brands Campaigner, Kickbox, Full Contact, and Email Industries, with SMTP positioned as the delivery backbone for that ecosystem. The company holds GDPR, CCPA, CASL, EU-U.S. and Swiss-U.S. Data Privacy Framework, UK Extension, and APEC CBPR certifications. SMTP is a private subsidiary of a public parent; specific revenue, ARR, and headcount trends are not separately disclosed.
SMTP firmographics
Firmographics- Name
- SMTP
- Legal name
- j2 Global Canada, Inc.
- Website
- https://smtp.com
- Company type
- Private
- Founded year
- 2003
- Operating status
- Operating
- Headcount range
- 51–100 employees
- Short description
- SMTP.com is a cloud-based email relay and transactional email API provider serving 100,000+ businesses globally, processing billions of emails monthly with a self-reported 98% delivery rate, operating as the delivery backbone within Ziff Davis's Martech Division.
- Ownership category
- akta.pro rank
Where SMTP is headquartered
LocationHeadquarters
- HQ city
- Woburn
- HQ country
- United States
- HQ region
- North America
Offices5 records
Markets served
SMTP business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Technology or R&D, Infrastructure, Personnel, Marketing or Sales, Operations
Revenue model
- Subscription-based Email Relay Plans: Monthly/annual subscription plans billed based on email volume quotas (e.g., 50,000 to 1,000,000+ emails per month). Plans auto-renew with credit card billing.
- Usage Overage Charges: When customers exceed their plan quota, overages are charged at 1.25x the pro-rated price per email. Overage can be disabled upon request.
- Add-on Services: Optional add-ons including Reputation Defender (list hygiene/proputation protection) and Insight Engine (customer data enrichment) available for additional monthly fees.
- Dedicated IP Addresses: Dedicated IP addresses available as add-on for full control over sender reputation, priced from $80/month.
- Affiliate Partner Program: Partners earn referral fees (portion of qualifying revenue for one year) for generating sales through unique affiliate links.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Subscription | Monthly | 50,000 Emails/Month - Entry Tier |
| Subscription | Monthly | 100,000 Emails/Month |
| Subscription | Monthly | 500,000 Emails/Month - Mid-Tier |
| Subscription | Monthly | 1,000,000 Emails/Month - High-Volume Tier |
| Subscription | Monthly | Dedicated IP Add-on |
| Hybrid | Multi-year contract | Custom/Enterprise Plans |
Go-to-market motion2 records
Distribution channels4 records
Marketing channels8 records
SMTP product offering
Product offeringCore offering
SMTP (SMTP.com) provides a cloud-based email relay and transactional email delivery platform for businesses and developers. Its core offering is the SMTP Email Relay Service, complemented by a RESTful Email API for programmatic integration, transactional email sending (order confirmations, notifications, authentication), managed delivery services for enterprises, and optional add-ons including Reputation Defender (list hygiene) and Insight Engine (customer data enrichment). The platform processes billions of emails monthly across shared and dedicated IP infrastructure.
Product overview
SMTP offers a unified email delivery platform centered on its core SMTP Email Relay Service and SMTP Email API. The platform provides transactional email capabilities, managed delivery services, and specialized solutions for developers and marketers. The product portfolio includes two optional add-on modules: Reputation Defender (for proactive list cleaning and IP reputation protection) and Insight Engine (for data-enriched customer profiling). Solutions are also available for high-volume senders and enterprise customers requiring managed services. The platform is designed to handle email delivery at scale with 99% uptime, supporting sending from thousands to billions of emails per month.
Differentiator
Problem solved
Functional benefit
Brands
- Reputation Defender: Proprietary email list hygiene tool that proactively protects sender reputation by suppressing invalid email addresses at time of send, reducing hard and soft bounce rates.
- Insight Engine
Products and services
- SMTP Email Relay Service
Quantifiable outcome
- 98% email delivery rate
- +3 more outcomes
Companies that use SMTP
Customer profileNamed customers8 records
Segments5 records
Ideal customer profiles4 records
SMTP technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration13 records
AI capability2 records
Feature5 records
SMTP partnerships and signals
Strategic signalPartnerships
Five partnerships are on record, tiered core and minor.
- Ziff DaviscoreParent company of SMTP through J2 Global Canada, Inc. SMTP operates as part of the Ziff Davis Martech Division, serving as the delivery backbone for the unified email ecosystem including Campaigner, Kickbox, Full Contact, and Email Industries brands.
- CampaignerminorPart of Ziff Davis Martech Division ecosystem. Related email marketing brand within the same corporate family.
- KickboxminorPart of Ziff Davis Martech Division ecosystem. Email verification and validation brand within the same corporate family.
- Full ContactminorPart of Ziff Davis Martech Division ecosystem. Customer data enrichment brand within the same corporate family.
- Email IndustriesminorPart of Ziff Davis Martech Division ecosystem. Related email industry brand within the same corporate family.
Scale indicators9 records
Recent moves5 records
Expansion highlights5 records
SMTP competitors and assessment
Company assessmentOthers
- iContact: Email marketing brand within Ziff Davis's Martech portfolio alongside SMTP. While not a direct SMTP relay competitor, it is part of the same corporate ecosystem and cross-sell opportunity referenced in SMTP's positioning as the delivery backbone.
Direct peers
- Mailgun (Sinch): Developer-focused email API service owned by Sinch, offering SMTP relay, transactional email, and deliverability tooling. Competes directly with SMTP on API-first developer positioning and high-volume transactional email.
- SMTP2GO: SMTP relay and email delivery service targeting SMB and mid-market senders. Direct functional competitor named by SMTP in comparison materials, competing on price-per-email and reliability.
- Mailjet (Sinch): Email API and SMTP relay service for transactional and marketing emails, also part of Sinch. Competes directly with SMTP on developer APIs, deliverability, and EU-based data residency.
- Twilio SendGrid: Twilio's email API platform providing transactional and marketing email delivery via SMTP relay and REST API. Most direct competitor to SMTP, competing head-to-head for developers and high-volume senders on deliverability and price.
- Postmark (ActiveCampaign): Transactional email provider owned by ActiveCampaign, focused on fast, reliable inbox delivery for application-generated emails. Named explicitly by SMTP in comparison marketing; competes on deliverability and developer experience.
- SparkPost (MessageBird): Enterprise email delivery platform offering transactional and marketing email APIs with analytics and deliverability tools. Competes with SMTP for high-volume enterprise senders and is referenced as a comparable in the email API space.
Broad incumbents
- Klaviyo: Ecommerce-focused marketing automation platform with built-in transactional and bulk email sending. Represents the platform-consolidation threat to pure-play email infrastructure providers like SMTP.
- Brevo (formerly Sendinblue): Multi-channel marketing platform offering email API, transactional email, SMS, and CRM. Broader portfolio player than SMTP, but its transactional email product competes directly for the same mid-market customers.
- Amazon SES: AWS's cloud-native email sending service tightly integrated with the broader AWS ecosystem. Competes on price and bundled cloud value, particularly for customers already running workloads on AWS.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights7 records
Customer concentration
SMTP social profiles
Digital presenceSMTP compliance and trust
Trust signalCompliance5 records
SMTP financial estimates
Financial estimateRevenue estimate
Valuation estimate
SMTP leadership team
Management profileNumber of profiles
SMTP funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
SMTP M&A and investment
M&A and investmentM&A1 record
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about SMTP
What does SMTP do?
SMTP (SMTP.com) provides a cloud-based email relay and transactional email delivery platform for businesses and developers. Its core offering is the SMTP Email Relay Service, complemented by a RESTful Email API for programmatic integration, transactional email sending (order confirmations, notifications, authentication), managed delivery services for enterprises, and optional add-ons including Reputation Defender (list hygiene) and Insight Engine (customer data enrichment). The platform processes billions of emails monthly across shared and dedicated IP infrastructure.
Is SMTP a public or private company?
SMTP is a private company. It is classified as corporate owned and is currently operating.
When was SMTP founded?
SMTP was founded in 2003. It employs 51 to 100 people.
Where is SMTP based?
SMTP is headquartered in Woburn, United States, in the North America region.
How does SMTP make money?
Five revenue lines are on record. Subscription-based Email Relay Plans are the primary driver. The others are usage Overage Charges, add-on Services, dedicated IP Addresses and affiliate Partner Program.
Who are SMTP's main competitors?
iContact is listed as an others. Direct peers are Mailgun (Sinch), SMTP2GO, Mailjet (Sinch), Twilio SendGrid, Postmark (ActiveCampaign) and SparkPost (MessageBird). Broad incumbents are Klaviyo, Brevo (formerly Sendinblue) and Amazon SES.
Does SMTP have an API?
Yes. SMTP.com offers a RESTful JSON-formatted API v4 that enables developers to integrate email relay capabilities into custom or third-party applications. The API supports multiple authentication methods: URL-based authentication (https://api:{apikey}@api.smtp.com/v4), Basic Auth header, Bearer Token header, Custom X-SMTPCOM-API header, and Query String parameters. Responses follow the JSend specification. Features include API key management, DKIM key creation, and comprehensive email sending capabilities. The API is designed for flexibility and ease of integration with RESTful architecture. Developer documentation is at www.smtp.com/resources/api-documentation.