If you’re reconsidering Mailgun, the reason usually falls into one of three buckets: pricing increases after the Sinch acquisition, shared-IP deliverability that has measurably declined, or support that degrades at lower plan tiers. The best replacement depends on which of those is your primary pain point. For raw deliverability on transactional email, Postmark is the clearest upgrade. For cost at scale, Amazon SES costs a fraction of Mailgun’s volume tiers if you have engineering bandwidth to operate it. For a modern developer experience without the operational overhead, Resend and MailerSend are both worth evaluating.
This guide covers seven credible alternatives with verified pricing, honest trade-offs, and a decision framework by scenario. If you’re also comparing SendGrid alternatives, you’ll find significant overlap in the candidates but different priority questions.
Why Developers Are Leaving Mailgun
Mailgun was acquired by Sinch in 2021, and the pricing and product trajectory since then has frustrated a meaningful share of its user base. The Flex plan price doubled from $1.00 to $2.00 per 1,000 emails effective December 2025, according to pricing trackers. Users on review platforms cite 20-40% general price increases since the acquisition.
The deliverability picture has also shifted. According to analysis from The Digital Bloom’s B2B Email Deliverability Report, Mailgun’s inbox placement rate fell from 53.80% to 26.05% between Q1 2024 and Q1 2025, a drop of nearly 28 percentage points. That kind of decline in a single year suggests pressure from the shared sending infrastructure that blends transactional and marketing traffic.
Support quality is the third recurring complaint. G2 reviewers cite “poor customer support” and “lack of communication regarding account issues” among the most common grievances, particularly on lower-tier plans.
None of this makes Mailgun the wrong choice for every team. If you’re on the Scale plan ($90/month, 100K emails), have a dedicated IP, and your deliverability is clean, the switching costs are real and the urgency is lower. The alternatives below are for teams where one of those conditions doesn’t hold.
Seven Mailgun Alternatives at a Glance
| Provider | Best For | Free Tier | Starting Paid Price | Dedicated IPs | API + SMTP |
|---|---|---|---|---|---|
| Postmark | Highest transactional deliverability | 100 emails/mo | $15/mo (10K emails) | $50/mo add-on (Pro/Platform) | Both |
| Amazon SES | High-volume senders on AWS | 3,000/mo (12 mo) | $0.10/1,000 emails | $24.95/mo per IP | Both |
| Resend | React/TypeScript teams | 3,000/mo | $20/mo (50K emails) | $30/mo (Scale plan) | API-first |
| MailerSend | Best free tier at low volume | 500/mo | $7/mo (Starter, 5K emails) | Not listed publicly | Both |
| Brevo | All-in-one: API + automation | 300/day (~9K/mo) | ~$9/mo (5K emails) | Not listed on free/starter | Both |
| SMTP2GO | Deliverability reliability + SMTP teams | 1,000/mo | $15/mo (10K emails) | Included on Professional ($75/mo) | Both |
| Bird (SparkPost) | Large-scale senders, enterprise infra | Free trial | $20/mo (50K emails) | On Starter and above | Both |
Pricing from official vendor pages as of June 2026. Free tier structures vary; see each section below for current limits and conditions.
Postmark: Best Pure-Play Transactional Deliverability
Postmark’s fundamental design choice is separating transactional and broadcast email onto entirely different IP pools. A marketing blast from a neighboring sender on Mailgun can drag down your shared-IP reputation. On Postmark, that contamination path doesn’t exist because marketing sends are not mixed with transactional sends at the infrastructure level.
Every account is manually reviewed before the first email goes out, and Postmark publishes live delivery statistics. According to Postmark’s deliverability documentation, their shared IP pools are transactional-only and have been actively managed for over a decade.
Pricing per Postmark’s pricing page: Free at 100 emails/month with no expiry. Basic at $15/month for 10,000 emails ($1.80/1K overage). Pro at $16.50/month (most popular, $1.30/1K overage). Platform at $18/month ($1.20/1K overage). Dedicated IPs cost $50/month as an add-on, available on Pro and Platform for accounts sending 300K+ emails/month.
Support on all paid plans includes email, chat, and phone with sub-two-hour average response times. No gating behind premium tiers.
Where it falls short: No lifecycle automation. No behavior-triggered flows. Postmark sends individual transactional emails reliably and that is the complete product surface.
Pick Postmark if: Deliverability reliability on transactional email is your top priority and you’re comfortable using a separate tool for any lifecycle automation needs.
Amazon SES: Best for Cost-Sensitive High-Volume Senders
At $0.10 per 1,000 emails (AWS SES pricing page), SES is the cheapest raw email infrastructure available by a significant margin. At 1 million sends per month, you’re paying $100 in base sending fees, where Mailgun’s Scale plan at 100K would already cost $90 and volume overages would push the cost substantially higher.
The realistic total-cost picture adds more. Virtual Deliverability Manager costs an additional $0.07 per 1,000 emails, bringing the effective rate to around $0.17/1K for senders who need monitoring. Dedicated IPs (Standard) run $24.95/month per IP and require warmup that you manage yourself. New accounts start in a sandbox that restricts who you can email until AWS grants production access, which can take several days.
Free tier: 3,000 emails/month for 12 months for new accounts. Accounts created after July 15, 2025 receive $200 in AWS Free Tier credits instead.
SES is infrastructure with an API, not a managed service. Bounce handling, suppression lists, reputation monitoring, and IP warmup are your responsibility. Teams without AWS experience regularly underestimate the setup and maintenance overhead, especially at moderate volumes where the cost savings are smaller.
Where it falls short: No templates, no automation, no meaningful support beyond AWS documentation. Account approval friction at the start. High operational complexity that doesn’t amortize well below 50K-100K monthly sends.
Pick SES if: You’re already on AWS, you’re engineering-heavy, and volume is your primary cost driver above 100K sends/month.
Resend: Best for React and TypeScript Stacks
Resend was built by the creator of React Email, an open-source library for writing responsive email templates as React components. If your team is building with Next.js, TypeScript, or any React-based framework, the integration removes the usual friction of maintaining separate HTML templates and keeping them in sync with your component library.
SDKs are available in nine languages: Node.js, Python, Go, Ruby, PHP, Java, Elixir, Rust, and .NET. The REST API is clean and well-documented.
Pricing per Resend’s pricing page: Free at 3,000 emails/month with a 100/day limit. Pro starts at $20/month for 50,000 emails (no daily limit, 10 domains). Scale at $90/month for 100,000 emails, with dedicated IPs at $30/month and Slack support included. Resend doubled several Scale tier prices in October 2024, so the price history is shorter and less stable than Postmark or Mailgun.
Deliverability is solid for a newer entrant, but the track record at enterprise scale is shorter than Postmark’s decade-plus history. For teams building new products on modern stacks, the developer experience is a genuine differentiator. For teams migrating established sending volumes, that maturity gap is worth weighing.
Where it falls short: No lifecycle automation. Less proven at very high send volumes. The React Email integration is meaningless if you’re not in that ecosystem.
Pick Resend if: Your team builds with React/TypeScript and you want email templates that compose like components, not HTML you debug by checking a preview client.
MailerSend: Best Value at Low-to-Mid Volume
MailerSend sits in a less discussed segment: genuinely generous on features relative to price for teams sending under 50K emails/month. The paid entry point is $7/month for 5,000 emails, with a $28/month plan covering 50,000 emails. A Professional tier at $110/month (or $99/month annually) handles 50,000 emails with priority support and email testing tools included.
The free tier dropped in December 2025 from 3,000 emails/month to 500 emails/month with a 100/day cap, which limits its usefulness for anything beyond basic testing. On paid plans, MailerSend includes API, SMTP relay, webhooks, inbound routing, real-time activity logs, and multiple template editors per MailerSend’s plans documentation.
SDKs are available for PHP, Python, Node.js, Ruby, Go, Java, and C#. The API is well-documented and the dashboard is cleaner than Mailgun’s.
Where it falls short: No dedicated IPs listed on public plans. Less established deliverability data than Postmark or Mailgun at high volume. The free tier change in late 2025 makes it less useful as a trial environment.
Pick MailerSend if: You’re sending under 50K emails/month, you want straightforward API and SMTP access without overpaying for features you don’t use, and you don’t need dedicated IPs.
Brevo: Best When You Need API Sending Plus Automation
Brevo (formerly Sendinblue) solves the tooling fragmentation problem: most pure email APIs don’t include lifecycle automation, and most automation platforms don’t expose a clean transactional API. Brevo does both.
The transactional API supports REST with SDKs in PHP, Python, Node.js, Ruby, Go, Java, and C#. Integration typically takes under 15 minutes via REST or SMTP relay. On top of transactional sending, Brevo includes behavior-triggered automation flows, contact segmentation, and multi-channel messaging (email, SMS, in-app) on paid plans.
Free plan includes 300 emails/day (roughly 9,000/month) with full API and SMTP relay access. The Starter plan begins around $9/month for 5,000 emails and removes the daily sending cap. Pay-as-you-go email credits are also available for irregular send volumes, and they don’t expire.
Brevo’s pricing model is email-volume-based on transactional plans and contact-count-based on marketing plans, which can create confusion when pricing a combined use case. Review the Brevo pricing page carefully against your actual mix of transactional and lifecycle sends.
Where it falls short: Deliverability on shared infrastructure is adequate but not at Postmark’s level. The feature breadth adds setup and configuration overhead that a pure sending API avoids. Pricing clarity across the transactional/marketing split requires careful reading.
Pick Brevo if: You need both transactional API sending and lifecycle automation without stitching two separate platforms together, and you want a free tier substantial enough to develop against in production.
SMTP2GO: Best for Teams Prioritizing SMTP Reliability and Support
SMTP2GO is less well-known than Postmark or Mailgun, but consistently earns strong marks for reliability and support quality in independent reviews. The product covers SMTP relay and REST API with a focus on deliverability and transparent reporting.
Free tier: 1,000 emails/month with a 200/day limit and 5 days of reporting history. No credit card required. Starter at $15/month for 10,000 emails, 30-day reporting, subaccount management, and phone/chat/ticket support. Professional at $75/month for 100,000 emails, includes a dedicated IP and email testing tools per SMTP2GO’s pricing page.
Overage rates are $1.00 per additional 1,000 emails on Starter and $0.85 on Professional. The 1,000 email free tier is more useful than MailerSend’s post-December 2025 free tier for initial integration testing.
Where it falls short: Less developer ecosystem visibility than Postmark or Resend. No automation layer. Not a household name in the SaaS developer community, which means less community-sourced troubleshooting when you hit unusual edge cases.
Pick SMTP2GO if: You’re prioritizing SMTP reliability, you want responsive support included at the Starter tier, and you’d rather avoid the prestige premium attached to higher-profile alternatives.
Bird (SparkPost): Best for Large-Scale Senders Requiring Enterprise Infrastructure
SparkPost was one of the few email providers with serious enterprise-grade sending infrastructure and a deliverability toolset that matched it. Since the MessageBird (now Bird) acquisition and rebrand, the product has shifted toward an enterprise focus with pricing that reflects it.
Starter plan at $20/month covers up to 50,000 emails with dedicated IPs available and overage rates at $0.85/1K. Premier at $75/month for 100,000 emails with $0.55/1K overage. Enterprise pricing is custom. Per the Bird email pricing page, volume and feature transparency at the lower tiers have declined relative to the pre-acquisition SparkPost.
Deliverability tooling at the enterprise tier is among the most comprehensive available, including inbox placement testing, real-time analytics, and IP management. For teams sending at multi-million-email volumes where those tools justify the cost, Bird is worth evaluating. For teams at moderate volumes looking for a straightforward migration from Mailgun, the enterprise orientation is friction.
Where it falls short: Less pricing transparency than competitors at lower tiers. Product direction has shifted toward enterprise deals over developer self-serve. The rebrand from SparkPost has reduced community mindshare in developer circles.
Pick Bird if: You’re a large-scale sender who needs enterprise deliverability infrastructure and dedicated account support, and you’re evaluating providers with a procurement process rather than a credit card.
How to Choose: Scenarios
For a broader view across the full provider landscape, see the transactional email services comparison.
The deliverability problem. If inbox placement is why you’re leaving Mailgun, Postmark is the clearest upgrade. Their transactional-only IP pools remove the shared-infrastructure risk that caused Mailgun’s placement rates to decline. The price premium over Mailgun is real but predictable.
The cost problem. If Mailgun’s volume pricing or post-acquisition increases are the issue, Amazon SES solves the unit cost problem completely at high volumes. The caveat: you’re exchanging a managed service for infrastructure, and the engineering overhead is substantial at first. Under 100K monthly sends, the savings rarely justify the setup investment.
The developer experience problem. If the Mailgun dashboard, API ergonomics, or documentation have been friction, Resend is the clearest alternative for React/TypeScript teams. MailerSend is worth evaluating for teams not in that ecosystem who want clean tooling at a lower price point.
The fragmentation problem. If you’re running a transactional API next to a separate lifecycle tool and want to consolidate, Brevo or a combined sending-plus-automation platform covers both without maintaining separate vendor relationships and data pipelines.
Stay on Mailgun if: You’re on the Scale plan with a dedicated IP, your deliverability is clean, and the recent pricing increases haven’t hit your use case. Switching email providers involves new IP warmup, re-authentication configuration, and a temporary adjustment period while inbox providers learn the new sending environment. Domain reputation is portable, but new IPs need time to establish trust.
Frequently Asked Questions
Is Mailgun still a good choice in 2026?
For teams on the Scale plan with a dedicated IP and stable deliverability, Mailgun remains viable. The concerns are most acute for teams on shared IPs: inbox placement benchmarks showed a significant decline in 2024-2025. Post-Sinch pricing increases have also been a recurring complaint, particularly the Flex plan doubling to $2.00/1K effective December 2025. Teams with clean deliverability and established workflows on Scale should weigh switching costs seriously before moving; teams on lower tiers with deliverability problems have more reason to look elsewhere.
What is the cheapest Mailgun alternative?
Amazon SES at $0.10 per 1,000 emails is the cheapest raw sending infrastructure by a significant margin. At 1 million emails/month, you’re paying $100 in base fees, compared to Mailgun’s volume pricing that scales considerably higher. The trade-off is operational complexity: bounce handling, suppression lists, IP warmup, and deliverability monitoring are your responsibility. For teams sending under 50,000 emails/month, MailerSend’s $7/month Starter plan often provides better cost-per-feature than the engineering overhead SES requires.
Which Mailgun alternative has the best deliverability?
Postmark consistently leads in transactional email deliverability benchmarks. Their defining architecture decision is separating transactional and broadcast email onto completely different IP pools, preventing marketing traffic from neighboring senders from contaminating transactional delivery rates. Every account is manually reviewed before sending begins. For teams where deliverability on password resets, order confirmations, and notifications is the primary requirement, Postmark is the strongest choice.
Is Amazon SES better than Mailgun?
It depends entirely on the dimension. On cost at high volume, SES wins by a large margin. On managed service quality, documentation, and setup experience, Mailgun is considerably easier to operate. SES is infrastructure: no templates, no lifecycle features, no meaningful support beyond AWS documentation, and a sandbox approval process before production access. Teams with engineering bandwidth and volumes above 100K/month will find SES’s economics compelling. Teams without those conditions will likely find Mailgun less painful to operate despite its higher cost.
Does switching from Mailgun hurt deliverability?
Temporarily, yes. Your sending domain’s reputation travels with you, but the new IP addresses have no established sending history. Inbox providers observe your behavior from the new infrastructure before extending full trust, even when domain reputation is strong. The practical approach is to migrate in phases: start with lower-stakes email types, warm up the new IPs gradually over several weeks, and move critical transactional traffic last once the new environment has established a baseline. Switching all volume overnight from a cold IP is likely to produce a temporary dip in placement.
What is the best Mailgun alternative for a small SaaS with low volume?
MailerSend at $7/month for 5,000 emails provides a clean API, good documentation, and a feature set comparable to Mailgun’s Foundation plan at lower cost. SMTP2GO’s free tier at 1,000 emails/month is more useful than MailerSend’s post-2025 free tier (500/mo) for initial integration testing. Resend’s free plan at 3,000 emails/month with a 100/day limit is strong if your stack is React-based. For very low volume with future automation needs, Brevo’s 300 emails/day free plan includes the full API and covers lifecycle automation on paid tiers.
I’ve spent my career building software at scale with a soft spot for email: deliverability, lifecycle campaigns, and getting messages to actually land. I started Coldletter to fix what bugged me about transactional and marketing email tools. I’m based in Vancouver.