How we make this list: we compare pricing pages, product documentation and public user reviews. Ratings come from G2, Capterra or Trustpilot, with the date we checked them.
Mailjet is the best white label email marketing platform for most agencies because it combines a free tier, subaccounts, and white-label sending domains from 9 dollars a month. Mailgun suits developers who send transactional email at scale, Postmark suits teams that need the fastest inbox delivery, and Ongage suits large agencies that resell email as a managed service.
Key takeaways
- White label means your clients see your brand, not the vendor: custom sending domains, branded dashboards, and subaccounts are the features that matter.
- Mailjet starts at 9 dollars a month for 8,000 emails, with a free tier of 6,000 emails a month, and supports subaccounts for client separation.
- SendGrid no longer offers a permanent free plan, only a 60-day trial, and its Essentials plan starts at 19.95 dollars a month for 50,000 emails.
- Postmark and Mailgun both start at 15 dollars a month for 10,000 emails, but Postmark is built for transactional email while Mailgun is built for developers.
- Ongage is the only platform in this list built specifically for white-label reselling, and its Starter plan is reported at 399 dollars a month.
What does white label mean for email marketing?
White label means the platform runs under your brand. Your clients log into a dashboard with your logo, your domain, and your colors, and the emails they send come from your sending domains, not the vendor's. The features that make this possible are subaccounts, which keep each client's contacts and campaigns separate; custom sending domains with SPF, DKIM, and DMARC records; and an API that lets you provision accounts, set sending limits, and pull reporting into your own system. A platform that only lets you add a logo is not really white label. Rankite already covers the general market in its guide to the best email marketing platforms, which lists Mailchimp, Brevo, and Kit. This guide covers the platforms that agencies and software companies use to resell email under their own name.
Use an email API such as Mailgun, SendGrid, Postmark, or Elastic Email if you send transactional email, such as receipts, password resets, and notifications, and you want to control the sending infrastructure yourself. Use a marketing platform such as Mailjet or Ongage if your clients send campaigns and automations and need a dashboard they can log into. The two categories overlap: Mailjet and Elastic Email both offer a marketing interface and an API, while SendGrid and Mailgun focus on the API and add a marketing campaigns product on top. For a software company embedding email into its product, an API is the right choice. For an agency reselling email marketing to local businesses, a marketing platform with subaccounts is the right choice.
Entry prices run from 9 dollars a month for Mailjet Starter to 399 dollars a month for Ongage Starter. Most API platforms start at 15 to 25 dollars a month for 10,000 to 50,000 emails: Mailgun Basic is 15 dollars for 10,000, Postmark Basic is 15 dollars for 10,000, SendGrid Essentials is 19.95 dollars for 50,000, and Elastic Email API Starter is 19 dollars for 50,000. SMTP.com starts at 25 dollars for 50,000, and SocketLabs starts at 39.95 dollars for 40,000. The real cost driver is volume: overage charges run 1.30 to 1.80 dollars per 1,000 extra emails, and a dedicated IP address adds 50 dollars a month or more. Budget for the dedicated IP if you send for multiple clients, since a shared IP means another client's reputation affects your delivery.
Comparison table
| Platform |
Best for |
Starting price |
Free plan |
| Mailjet |
Agencies reselling campaign email |
9 dollars per month for 8,000 emails |
Yes, 6,000 emails per month |
| SendGrid |
Developers sending at scale |
19.95 dollars per month for 50,000 emails |
No, 60-day trial only |
| Mailgun |
Developers sending transactional email |
15 dollars per month for 10,000 emails |
Yes, 100 emails per day |
| Postmark |
Transactional email with fast delivery |
15 dollars per month for 10,000 emails |
Yes, 100 emails per month |
| Elastic Email |
Budget API and marketing sending |
19 dollars per month for 50,000 API emails |
Yes, 3,000 emails per month |
| SMTP.com |
Reliable SMTP relay for businesses |
25 dollars per month for 50,000 emails |
No |
| SocketLabs |
High-deliverability sending with support |
39.95 dollars per month for 40,000 emails |
Yes, first month free |
| Ongage |
Agencies reselling email as a service |
399 dollars per month, reported |
No |
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Mailjet | Agencies and software companies that want white-label campaign email with subaccounts | 9 dollars per month for Starter, 8,000 emails per month | Yes, 6,000 emails per month and 1,000 contacts |
 SendGrid | Developers and product teams sending high-volume transactional and marketing email | 19.95 dollars per month for Essentials, 50,000 emails per month | No permanent free plan, 60-day trial with 100 emails per day |
 Mailgun | Developers who want a flexible email API with white-label sending domains | 15 dollars per month for Basic, 10,000 emails per month | Yes, 100 emails per day |
 Postmark | Teams that need transactional email delivered fast with excellent deliverability | 15 dollars per month for Basic, 10,000 emails per month | Yes, 100 emails per month on the Developer plan |
 Elastic Email | Budget-conscious teams that need both an email API and a marketing platform | 19 dollars per month for Email API Starter, 50,000 emails per month | Yes, 1,000 contacts and 3,000 emails per month, 100 per day |
 SMTP.com | Businesses that want a reliable SMTP relay with white-label sending and human support | 25 dollars per month for Essential, 50,000 emails per month | No free plan |
 SocketLabs | Teams that want high-deliverability sending with strong support and a free first month | 39.95 dollars per month for Core, 40,000 emails per month | Yes, first month free up to 40,000 emails, then 2,000 per month |
 Ongage | Large agencies and enterprises that resell email marketing as a managed service | 399 dollars per month for Starter, reported | No free plan |
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#1Mailjet
Best for: Agencies and software companies that want white-label campaign email with subaccounts3.9/5 on
G2 (176 reviews, checked Oct 2026)
Visit mailjet.com
Starting price9 dollars per month for Starter, 8,000 emails per month
Free planYes, 6,000 emails per month and 1,000 contacts
Mailjet is the most accessible white-label email platform in this list. The free plan covers 6,000 emails a month for up to 1,000 contacts, Starter costs 9 dollars a month for 8,000 emails, Essential costs 19 dollars a month for 15,000 emails with unlimited contacts, and Premium costs 29 dollars a month for 15,000 emails with automations. Annual billing saves 10 percent. Subaccounts let an agency keep each client's contacts, templates, and campaigns separate, and custom sending domains keep the vendor's brand out of the email headers. The weakness is the feature ladder: real automation only arrives on the Premium plan, and the free tier's contact cap is small for an agency with several clients. For a small agency starting a white-label email offer, Mailjet is the cheapest credible entry point.
What we like- Free tier, subaccounts for client separation, white-label sending domains, annual billing saves 10 percent
Watch out for- The free tier caps at 1,000 contacts, and the Starter plan lacks the automation features that agencies usually need
#2
SendGrid
Best for: Developers and product teams sending high-volume transactional and marketing email
Visit sendgrid.com
Starting price19.95 dollars per month for Essentials, 50,000 emails per month
Free planNo permanent free plan, 60-day trial with 100 emails per day
SendGrid, now Twilio SendGrid, is one of the largest email APIs in the world. Essentials costs 19.95 dollars a month for 50,000 emails, or 34.95 dollars for 100,000, and Pro starts at 89.95 dollars a month. White-label sending is handled through authenticated domains and dedicated IP addresses, and the API is well documented for developers embedding email into a product. The main change to know is that SendGrid removed its permanent free plan in 2025 and now offers only a 60-day trial at 100 emails a day. The other weakness is the price jump: a team that outgrows Essentials faces a jump to nearly 90 dollars a month. For a software company sending tens of thousands of transactional emails a month, SendGrid remains a reliable choice.
What we like- Large scale, strong API documentation, white-label sending domains with dedicated IPs, part of Twilio
Watch out for- No permanent free plan since 2025, and the Pro plan from 89.95 dollars a month is a steep jump from Essentials
#3Mailgun
Best for: Developers who want a flexible email API with white-label sending domains4.2/5 on
G2 (322 reviews, checked Oct 2026)
Visit mailgun.com
Starting price15 dollars per month for Basic, 10,000 emails per month
Free planYes, 100 emails per day
Mailgun is a developer-focused email API that also offers a marketing campaigns product. Basic costs 15 dollars a month for 10,000 emails, Foundation costs 35 dollars for 50,000 or 75 dollars for 100,000, and Scale costs 90 dollars for 100,000. Overage is 1.30 dollars per 1,000 emails, and log retention is 5 days on the lower plans. White-label sending is supported through custom domains, and the platform includes email validation and routing rules. The weakness is that Mailgun is an API first: the campaign builder is basic compared with Mailjet or Ongage, so an agency that wants clients to design emails in a dashboard will find it thin. For a developer sending transactional email under their own brand, Mailgun is the most flexible option here.
What we like- Strong API, flexible routing and validation tools, white-label domains, clear overage pricing at 1.30 dollars per 1,000 emails
Watch out for- No built-in marketing campaign builder on the entry plan, and the free tier is too small for anything beyond testing
#4Postmark
Best for: Teams that need transactional email delivered fast with excellent deliverability4.6/5 on
G2 (32 reviews, checked Oct 2026)
Visit postmarkapp.com
Starting price15 dollars per month for Basic, 10,000 emails per month
Free planYes, 100 emails per month on the Developer plan
Postmark is a transactional email service known for fast delivery and strong inbox placement. Basic costs 15 dollars a month for 10,000 emails, Pro costs 16.50 dollars a month, and Platform costs 18 dollars a month, with overage at 1.80 dollars per 1,000 emails. A dedicated IP costs 50 dollars a month. There is no annual billing discount, which keeps pricing simple but removes a saving other vendors offer. White-label sending works through custom domains and subaccounts on the higher plans. The weakness is scope: Postmark is built for receipts, alerts, and password resets, not for marketing campaigns with templates and automations. For a software company whose transactional email must arrive in seconds, Postmark is the best deliverability choice in this list.
What we like- Fast delivery and strong inbox placement, simple pricing, no annual billing lock-in, dedicated IP available at 50 dollars a month
Watch out for- Built for transactional email rather than marketing campaigns, and the free tier is only 100 emails a month
#5Elastic Email
Best for: Budget-conscious teams that need both an email API and a marketing platform4.4/5 on
G2 (214 reviews, checked Oct 2026)
Visit elasticemail.com
Starting price19 dollars per month for Email API Starter, 50,000 emails per month
Free planYes, 1,000 contacts and 3,000 emails per month, 100 per day
Elastic Email offers both an email API and a marketing platform at prices below the larger vendors. Email API Starter costs 19 dollars a month for 50,000 emails or 29 dollars for 100,000, and API Pro costs 49 dollars a month for 50,000. Marketing Starter costs 29 dollars a month for 2,500 contacts and 37,500 emails, and Marketing Pro costs 49 dollars a month. The free plan covers 1,000 contacts and 3,000 emails a month with a 100 per day cap. White-label features include custom domains and subaccounts. The weakness is polish: the interface and documentation are less refined than Mailjet or SendGrid, and the vendor is less widely known. For a small team that wants the most emails per dollar with both API and campaign tools, Elastic Email is the best value here.
What we like- Low prices for the volume, both API and marketing plans, free tier with a usable contact limit
Watch out for- Smaller brand than SendGrid or Mailgun, and the interface is less polished than Mailjet
#6
SMTP.com
Best for: Businesses that want a reliable SMTP relay with white-label sending and human support
Visit smtp.com
Starting price25 dollars per month for Essential, 50,000 emails per month
Free planNo free plan
SMTP.com is a straightforward email relay service with white-label sending. Essential costs 25 dollars a month for 50,000 emails on a shared IP, Starter costs 80 dollars a month for 100,000 emails with a dedicated IP, Growth costs 300 dollars a month for 500,000, and Business costs 500 dollars a month for 1,000,000. The platform focuses on reliable delivery rather than campaign design, and support is a selling point for teams that want a human to help with deliverability problems. The weakness is that there is no free plan and no real marketing campaign builder, so an agency reselling campaign email will need another tool for design and automation. For a business that sends transactional or notification email and wants a dependable relay, SMTP.com is a solid choice.
What we like- Simple SMTP relay, dedicated IP included from the 80 dollar Starter plan, strong deliverability support
Watch out for- No free plan, and the marketing features are thin compared with Mailjet or Ongage
#7
SocketLabs
Best for: Teams that want high-deliverability sending with strong support and a free first month
Visit socketlabs.com
Starting price39.95 dollars per month for Core, 40,000 emails per month
Free planYes, first month free up to 40,000 emails, then 2,000 per month
SocketLabs is an email sending platform built around deliverability, with an API, SMTP relay, and reporting. Core costs 39.95 dollars a month for 40,000 emails, and Pro costs 79.95 dollars a month for 100,000 emails with a dedicated IP included. The first month is free up to 40,000 emails, then the free allowance drops to 2,000 a month. White-label sending is supported through custom domains. The weakness is price: at 39.95 dollars for 40,000 emails, SocketLabs costs more than SendGrid or Elastic Email for similar volume, and the marketing campaign tools are limited. For a team that values deliverability support and a dedicated IP at a moderate price, SocketLabs is a reasonable pick.
What we like- Dedicated IP included on the Pro plan, strong deliverability focus, free first month for testing
Watch out for- The entry price is higher than Mailgun or Postmark for similar volume, and the marketing features are limited
#8
Ongage
Best for: Large agencies and enterprises that resell email marketing as a managed service
Visit ongage.com
Starting price399 dollars per month for Starter, reported
Free planNo free plan
Ongage is the only platform in this list designed from the start as a white-label email marketing platform for agencies. It connects to multiple email sending providers, so an agency can route different clients through different providers, and it offers subaccounts, custom branding, advanced segmentation, and reporting. Pricing is reported at 399 dollars a month for Starter, 949 dollars for Basic, and 1,499 dollars for Premium, with the Starter figure coming from third-party listings rather than a published vendor price, so confirm it with the vendor. The weakness is cost: at 399 dollars a month, Ongage only makes sense for an agency with enough email clients to spread the fixed cost. For a large agency reselling email as a core service, Ongage is the most complete white-label platform here.
What we like- Built specifically for white-label reselling, connects to multiple sending providers, advanced segmentation and reporting
Watch out for- The 399 dollar entry price is far above every other platform here, and the Starter price is reported by third parties rather than published by the vendor
We compared white-label email platforms named in agency and developer roundups and checked each vendor's pricing page or third-party pricing reports on 11 November 2026. We kept platforms with real white-label features, meaning subaccounts or custom sending domains, and a verifiable price. We excluded general email marketing tools such as Mailchimp and Brevo, which Rankite covers in its guide to the best email marketing platforms, because they do not offer true white-label reselling. Prices marked as reported come from third-party listings rather than published vendor prices, and we say so where a figure appears. For related decisions, see Rankite's guides to the best email marketing platforms, the best enterprise email marketing software, the best SMS marketing platform, and the best email marketing platforms for ecommerce.
Frequently asked questions
What is a white label email marketing platform?
It is an email platform that an agency or software company resells under its own brand. Clients see your logo and domain, not the vendor's, and their emails are sent from your sending domains. The key features are subaccounts for client separation, custom sending domains with SPF, DKIM, and DMARC, and an API for provisioning accounts and pulling reports.
Do I need a dedicated IP for white label email?
Yes, if you send for multiple clients. A dedicated IP means your delivery reputation is yours alone. On a shared IP, another sender's spam can hurt your inbox placement. Mailgun, Postmark, and SocketLabs offer dedicated IPs, with Postmark charging 50 dollars a month. Budget for it before you promise delivery rates to clients.
Which white label platform is cheapest?
Mailjet is the cheapest entry point at 9 dollars a month for 8,000 emails, with a free tier of 6,000 emails a month. Elastic Email is the cheapest per email at scale, at 19 dollars a month for 50,000 API emails. Both are far below Ongage, which is reported at 399 dollars a month and is built for large agencies rather than small teams.
Can I resell email without building my own platform?
Yes. That is the point of white-label platforms. Mailjet, Ongage, and Elastic Email give you subaccounts and branded dashboards, so your clients log into your version of the platform. You set the client price, collect payment, and pay the vendor for the underlying sending volume. You do not need to build sending infrastructure yourself.
Is SendGrid good for white label email?
SendGrid works well for white-label transactional email through authenticated sending domains and dedicated IPs, and its API is strong. It is less suited to reselling campaign email to small businesses, because it has no permanent free plan and its campaign builder is basic compared with Mailjet or Ongage. Use SendGrid when your product sends transactional email at scale.
Sources we checked (8)
- https://www.mailjet.com
- https://www.sendgrid.com
- https://www.mailgun.com
- https://www.postmarkapp.com
- https://www.elasticemail.com
- https://www.smtp.com
- https://www.socketlabs.com
- https://www.ongage.com
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has 5+ years in B2B and SaaS SEO. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.