7 Best Mailgun Alternatives in 2026: Tested Email APIs Compared

Postmark is the best Mailgun alternative for most teams in 2026. It costs $15 per month for 10,000 emails, matches Mailgun's Basic price, and leads the market on deliverability and support. Resend is the best pick for modern JavaScript stacks, and Amazon SES is the cheapest option at scale.

Mailgun gave developers fresh reasons to compare options. The pay-as-you-go Flex plan moved to $2 per 1,000 emails in December 2025, a steep rate for low-volume senders. The free tier now allows only 100 emails per day, with paid plans starting at $15 per month for 10,000 emails on Basic. Entry tiers also gate features like dedicated IPs and extended log retention behind the $35 Foundation and $90 Scale plans.

Transactional email is not a place to overpay or under-deliver. Password resets, receipts, and alerts must land in the inbox every time. We tested seven Mailgun competitors on price, deliverability, developer experience, and support. If you are choosing tools for the whole funnel, start with our guide to the best AI marketing tools, then use this list to replace Mailgun.

Quick Comparison: Top 7 Mailgun Alternatives in 2026

Service	Best For	Starting Price	Free Tier
Postmark	Deliverability and support	$15/mo (10,000 emails)	100 emails/mo developer tier
Resend	Modern JavaScript stacks	$20/mo (50,000 emails)	Yes, 3,000 emails/mo
Amazon SES	Cheapest at scale	$0.10 per 1,000 emails	Pay-as-you-go
SMTP2GO	Relay with human support	Paid plans by volume	Yes, 1,000 emails/mo
MailerSend	Transactional + templates	$28/mo	Yes, 500 emails/mo
Brevo	Email + marketing in one	$9/mo	Yes, 300 emails/day
Twilio SendGrid	Twilio ecosystem teams	$19.95/mo (50,000 emails)	No, 60-day trial

Why Switch From Mailgun?

Developers switch from Mailgun because pay-as-you-go pricing jumped to $2 per 1,000 emails in December 2025, the free tier caps at 100 emails per day, and key features sit behind the $35 and $90 tiers. The API itself remains solid. The pricing and packaging changed around it.

The December 2025 Flex change hit small senders hardest. At $2 per 1,000, sending 10,000 occasional emails costs $20 on Flex versus $15 flat on Basic, and versus $1 total on Amazon SES. Meanwhile reviewers point to entry-tier feature gaps, including log retention and support limits, as the second driver of migrations under Sinch's ownership.

The same story played out across the category. Twilio retired SendGrid's free plan in 2025, which we covered in our SendGrid alternatives guide. Transactional providers keep repricing, so the winning move is knowing the current market rate for your volume before renewal.

The 7 Best Mailgun Alternatives in 2026

Postmark wins on deliverability, Resend wins on developer experience, and Amazon SES wins on cost at scale. SMTP2GO and MailerSend fit teams that want support and templates. Brevo bundles marketing email. SendGrid fits Twilio-centric stacks.

1 Postmark: Best for Deliverability and Support

Postmark is a transactional-first service famous for fast inbox placement and responsive humans.

What it does well. Postmark separates transactional and broadcast streams by design, which protects the sending reputation of your receipts and password resets. Time-to-inbox stays consistently low, and support answers with engineers, not scripts. Pricing is flat and public: $15 per month covers 10,000 emails, the same sticker as Mailgun Basic with stronger included support.

Key features:

• Separate message streams for transactional and broadcast email
• 45 days of full content history on paid plans
• Detailed delivery, open, and bounce analytics
• SMTP and REST API with official libraries
• Human support with published response quality

Pricing. Plans start at $15 per month for 10,000 emails and scale by volume. See postmarkapp.com for tiers.

Best for: SaaS products where password resets and receipts must arrive instantly, and teams that value support over the lowest possible rate.

Limitations. Per-email cost at high volume runs above relay-style rivals, per EmailTooltester's 2026 comparison. There is no built-in marketing suite, and strict sending policies reject mixed or purchased lists.

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2 Resend: Best for Modern JavaScript Stacks

Resend is a developer-first email API built around React Email templates.

What it does well. Resend treats email as code. You build templates as React components, preview them in development, and ship through a clean SDK. The free tier covers 3,000 emails per month, and the Pro plan covers 50,000 for $20, undercutting Mailgun's $35 Foundation tier at similar volume. For Next.js and Node teams, setup takes minutes.

Key features:

• React Email template framework
• SDKs for Node.js, Python, PHP, Go, Rust, and more
• Domains, webhooks, and suppression management via API
• Permanent free tier of 3,000 emails/month
• Broadcast and audience features for product updates

Pricing. Free for 3,000 emails per month, then $20 per month for 50,000. Details at resend.com.

Best for: Startups on JavaScript and TypeScript stacks that want templates, sending, and testing unified in the codebase.

Limitations. The platform is younger than Postmark or SES, so long-term reputation data is thinner. Enterprise features like dedicated deliverability consulting remain limited.

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3 Amazon SES: Best Price at Scale

Amazon SES is the raw-infrastructure option: minimal interface, unbeatable unit cost.

What it does well. Nothing touches SES on price. Sending costs $0.10 per 1,000 emails, so one million emails run $100 versus roughly $2,000 on Mailgun Flex's December 2025 rate. Deliverability infrastructure is AWS-grade, and SES plugs directly into IAM, Lambda, and CloudWatch for event-driven email pipelines.

Key features:

• $0.10 per 1,000 emails, pay-as-you-go
• Dedicated IPs and managed IP warmup options
• Configuration sets, event publishing, and suppression lists
• Native integration with the AWS ecosystem
• Virtual deliverability manager dashboards

Pricing. $0.10 per 1,000 outbound emails plus small attachment data fees. Current rates at aws.amazon.com.

Best for: High-volume senders with engineering resources who want the lowest cost per email and already run on AWS.

Limitations. SES ships no template editor worth using, minimal analytics, and no support without a paid AWS support plan. Reputation management is your job, and misconfigured senders get throttled.

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4 SMTP2GO: Best Relay With Human Support

SMTP2GO is a straightforward SMTP relay with a generous free tier and responsive support.

What it does well. SMTP2GO does one job reliably: relay your email with strong deliverability and give you a human when something breaks. The free tier covers 1,000 emails per month, which beats Mailgun's 100-per-day trial cap for hobby projects. Setup is plain SMTP credentials, so legacy apps, printers, and CRMs connect without code changes.

Key features:

• SMTP relay plus REST API
• Permanent free tier of 1,000 emails/month
• 24/7 support on paid plans
• Bounce, spam trap, and blacklist monitoring
• Regional sending infrastructure across continents

Pricing. Paid plans scale by monthly volume, with cheap-relay pricing around $75 to $100 per 100,000 emails in its class. See smtp2go.com.

Best for: Small businesses and IT teams that need dependable relay for apps and devices without rebuilding integrations.

Limitations. Template tooling and developer ergonomics trail Resend and Postmark. It is a relay first, not a full email platform.

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5 MailerSend: Best for Transactional Email With Templates

MailerSend pairs a transactional API with drag-and-drop templates non-developers can edit.

What it does well. MailerSend, built by the MailerLite team, lets developers wire up the API once, then hands template editing to support or marketing through a visual builder. That split saves engineering time every time a receipt layout changes. Paid plans start at $28 per month, with a free tier of 500 emails per month to test with.

Key features:

• Drag-and-drop and HTML template builders
• REST API, SMTP, and official SDKs
• Inbound routing and email verification add-ons
• Multi-domain management with role permissions
• Analytics with engagement breakdowns

Pricing. Free for 500 emails per month, then from $28 per month as volume grows. Details at mailersend.com.

Best for: Product teams where non-developers maintain email templates and volumes sit in the low-to-mid range.

Limitations. The free tier shrank from earlier years, and raw per-email cost at scale runs above SES and relay-style options.

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6 Brevo: Best All-in-One With Transactional Email

Brevo bundles a transactional API with marketing campaigns, CRM, and SMS on one platform.

What it does well. Brevo replaces two or three tools at once. The same account sends password resets through the API and newsletters through the campaign builder, with shared contacts and analytics. The free tier allows 300 emails per day, and paid plans start around $9 per month. That makes Brevo the cheapest way to consolidate transactional and marketing email. We compare its marketing side in our Brevo alternatives guide and in Mailchimp vs Brevo.

Key features:

• Transactional API and SMTP alongside campaigns
• Free tier of 300 emails/day
• Built-in CRM, automation, and SMS
• Shared templates and contact data across both email types
• Pay-per-email pricing model, not per-contact

Pricing. Free for 300 emails per day, with paid plans from $9 per month by volume. See brevo.com.

Best for: Small businesses that want one bill covering transactional email, newsletters, and a lightweight CRM.

Limitations. Deliverability tooling for pure transactional streams trails Postmark, and the daily cap on the free plan interrupts bursty sending.

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7 Twilio SendGrid: Best for Twilio Ecosystem Teams

SendGrid remains the highest-volume name in email APIs, now fully paid.

What it does well. SendGrid's API, docs, and ecosystem integrations remain mature and battle-tested at extreme scale. For teams already using Twilio for SMS and voice, unified billing and tooling make it the low-friction pick. Twilio retired the permanent free plan in 2025; new accounts get a 60-day trial at 100 emails per day, then Essentials starts at $19.95 per month for 50,000 emails.

Key features:

• Proven infrastructure at billions of emails per month
• Dynamic templates with Handlebars
• Email validation API and deliverability insights
• Deep Twilio ecosystem integration
• Marketing Campaigns product on the same account

Pricing. Email API Essentials from $19.95 per month for 50,000 emails, with overage at $0.00133 per email. See sendgrid.com.

Best for: Teams standardized on Twilio, and high-volume senders that want a long-established vendor.

Limitations. No permanent free tier, support quality complaints persist on entry plans, and shared IP reputation varies. Our SendGrid alternatives roundup lists the escape routes.

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How Should You Choose the Right Mailgun Alternative?

Choose by volume and team shape: Postmark under 100,000 emails per month when deliverability matters, Amazon SES above that when you have engineers, Resend for JavaScript teams, and Brevo when one tool must cover transactional plus marketing.

Run four checks before you migrate:

• Price your real volume. Compute monthly cost at your actual send rate, including overages. At 10,000 emails, Postmark costs $15, SES costs $1, and Mailgun Flex costs $20. The ranking flips at different volumes.
• Separate your streams. Keep transactional and marketing email on separate domains or streams so a newsletter complaint never blocks a password reset. Our best AI email marketing software guide covers the campaign side.
• Test deliverability yourself. Send seed tests to Gmail, Outlook, and Yahoo during the trial. Inbox placement differs by sender profile, so third-party averages only get you so far.
• Check migration surface. Count every place your code calls the Mailgun API, including webhooks and inbound routing. SMTP-based switches take an hour. Deep API integrations take days.

How We Evaluated These Email APIs

We compared each service on published pricing at 10,000 and 100,000 email volumes, free tier terms, deliverability reputation, developer experience, and support quality, using vendor pricing pages and dated 2026 third-party tests as sources.

We weighted deliverability and total cost most heavily because those two factors drive nearly every migration off Mailgun. Every figure links to the vendor's price sheet or a dated analysis such as EmailTooltester's 2026 transactional email test. We excluded services without public pricing. Rates reflect August 2026 and change often, so confirm on the vendor site before committing.

The Bottom Line

Postmark replaces Mailgun for most product teams: same $15 entry price, better deliverability record, and real support. Pick Resend if your stack is TypeScript, Amazon SES if you send millions and have engineers to spare, and Brevo if you want transactional and marketing email on one $9 bill.

Whatever you choose, run both providers in parallel for a week and compare inbox placement before cutting over. Then audit the rest of your stack. Our guides to the best AI marketing tools and best SendGrid alternatives cover the adjacent decisions.

Frequently Asked Questions

What is the best Mailgun alternative in 2026?

Postmark is the best Mailgun alternative in 2026. It matches Mailgun's $15 entry price for 10,000 emails while delivering faster inbox placement, separate transactional message streams, and human support that Mailgun reserves for higher tiers.

Is there a free alternative to Mailgun?

Yes. Resend offers 3,000 free emails per month, SMTP2GO offers 1,000 per month, MailerSend offers 500 per month, and Brevo allows 300 per day. All four beat Mailgun's free tier, which caps at 100 emails per day.

Why did Mailgun get more expensive?

Mailgun moved its pay-as-you-go Flex plan to $2 per 1,000 emails in December 2025, which raised costs sharply for low-volume senders. Occasional senders now pay more on Flex than on the $15 Basic plan, pushing many to Postmark, Resend, or Amazon SES.

Is Amazon SES cheaper than Mailgun?

Yes, by a wide margin. Amazon SES charges $0.10 per 1,000 emails, so 100,000 emails cost $10 versus $90 on Mailgun's Scale plan. The trade-off is that SES provides minimal analytics, no template tooling, and no support without a paid AWS plan.

How hard is it to migrate off Mailgun?

Most migrations finish in under a day. Verify your domain on the new provider, add its DNS records, swap API credentials, and update webhook endpoints. Teams using plain SMTP only change credentials. Run both services in parallel briefly to confirm deliverability before switching fully.