9 Best Mailgun Alternatives for 2026: Pricing & Picks

9 Best Mailgun Alternatives for 2026: Pricing, Deliverability & Honest Picks

Mailgun doubled its Flex plan pricing overnight - from $1.00 to $2.00 per 1,000 messages, effective Dec 1, 2025. If you got that email, you're probably already shopping. The timing couldn't be worse: Mailgun's inbox placement rate sits at just 71.4% in independent testing, well below the 83.1% industry average. You're paying more for worse deliverability.

Switching ESPs isn't hard. Picking the right one is. Some of these alternatives are cheaper, some deliver better, and a few do both - but every guide out there still lists SendGrid's free tier (it doesn't exist anymore) and skips the pricing gotchas that actually matter.

Our Picks (TL;DR)

Why Teams Switch from Mailgun

The price hike is the catalyst, but it's not the whole story. Mailgun carries a 4.3/5 rating across 196 reviews on SoftwareAdvice, which sounds decent until you read the actual complaints. Two themes dominate: "expensive at large scale" and "not user friendly for non-developers."

Deliverability is the deeper issue. Across developer forums like LowEndTalk, the reaction to the price hike was immediate - and the deliverability complaints piled on. One commenter said "deliverability quality took a one-way trip" downward. Others described it as "very spotty." The Mailtrap benchmark backs this up: Mailgun's 71.4% inbox placement trails Postmark (83.3%), Amazon SES (77.1%), and even Mailtrap itself (78.8%).

Here's the thing: if your transactional email volume is under 50K/month, you probably don't need to spend more than $20/month. Most teams are dramatically overpaying for infrastructure that underdelivers.

One Discourse user was paying ~$25/month for 25,000 emails - reasonable until you realize ZeptoMail handles that volume for under $7. At 100K+ emails, the gap widens dramatically.

Best Mailgun Alternatives Compared

Postmark - Best for Deliverability

Postmark is the provider you pick when inbox placement is non-negotiable. In Mailtrap's controlled benchmark, Postmark hit 83.3% inbox placement on shared IPs - the highest of any provider tested.

Use this if: You're sending transactional emails (password resets, receipts, notifications) and deliverability is your top priority. Pricing is straightforward: $15/mo for 10,000 emails on the Basic plan, with overages at $1.80/1K. The Pro plan at $16.50/mo drops overages to $1.30/1K - worth it if you regularly exceed 10K. Dedicated IPs start at $50/mo but require 300K+ monthly volume on a Pro plan.

Skip this if: You need a bargain at high volume. Postmark's per-email cost doesn't scale as aggressively as SES or ZeptoMail. Also watch the CC/BCC gotcha - each CC and BCC recipient counts as a separate email. Send one message to 5 people via BCC and you've burned 5 emails from your plan. Data retention caps at 45 days by default.

Resend - Best Developer Experience

Resend doesn't appear in most top-ranking guides for this topic, and that's a mistake. The developer experience is a generation ahead of everything else on this list - clean API, excellent docs, and features like multi-region sending and automatic suppression lists come standard on every plan.

We've migrated test workloads across several of these providers, and Resend consistently had the fastest time-to-first-email. The Pro plan runs $20/mo for 50,000 emails. Scale is $90/mo for 100,000. The free tier gives you 3,000 emails/month but caps daily sends at 100, limits you to 1 custom domain, 1 webhook endpoint, and just 1 day of data retention - fine for testing, not for production. Dedicated IPs are a $30/mo add-on on the Scale plan for customers exceeding 500+ emails/day, and Resend handles warmup and autoscaling.

Skip this if: You need a battle-tested platform with a decade of production history. Resend is newer and the ecosystem is still maturing. For millions of emails monthly with enterprise SLAs, evaluate carefully.

Amazon SES - Cheapest at Scale

Nothing touches SES on raw cost. At $0.10 per 1,000 emails, one Discourse user reported sending 5,441 emails for $0.54. That's not a typo. The free tier covers 3,000 messages/month for the first 12 months, and dedicated IPs run $24.95/mo - half what Postmark charges.

The tradeoff is real, though. SES is infrastructure, not a product. You need a developer comfortable with AWS. Production access requires an approval process that's rejected users without clear explanation. Tracking and analytics are bare-bones compared to other transactional email services.

And here's the billing gotcha everyone misses: SES charges per recipient. One email to 100 BCC recipients = 100 charges. At scale, that math matters. If you have the engineering resources, SES is the right call. If you don't, you'll spend more on developer time than you save on email costs.

ZeptoMail - Best Budget Transactional

ZeptoMail is the budget pick for teams sending transactional email without needing a full platform. One Discourse user sends ~120,000 emails/month for roughly $37. At $2.50 per 10,000 emails with no monthly commitment, the credit-based pricing is refreshingly simple. SMTP and API integration take minutes, not hours.

The catch: credits expire after 6 months. Buy $25 in credits, use $10 worth, and the remaining $15 disappears after 180 days. Only buy what you'll burn through. There's no free tier - you're buying credits upfront.

MailerSend - Best Free Tier

For side projects, staging environments, or low-volume transactional needs, MailerSend's free tier is hard to beat: 500 emails/month, 100/day, no credit card required. The Hobby plan at $7/mo for 5,000 emails is the cheapest paid entry point on this list, with a clean UI and solid template builder.

The gap between plans is where it gets tricky. Hobby caps at 5,000 emails, and Starter jumps to $35/mo for 50,000. There's no mid-tier option. Overage rates run $0.95-$1.20/1K depending on your plan, and the free plan simply pauses sending when you hit the daily limit - no overages, just silence.

SendGrid - Fading Default

Twilio retired SendGrid's free plan starting May 27, 2025. Every other guide still lists it. It doesn't exist.

The Essentials plan starts at ~$19.95/mo covering up to 50K emails. Essentials for 100K runs ~$34.95/mo. The platform is mature with extensive documentation and integrations - one user on Discourse praised it as "reliable even in China." But that 61.0% inbox placement in the Mailtrap benchmark is alarming: 20.9% of emails went missing. At mid-pack pricing with bottom-of-pack deliverability, SendGrid's days as a default recommendation are over.

SMTP2GO - Solid Mid-Market Pick

SMTP2GO doesn't get much attention in these roundups, which is a shame. The Starter plan runs $10/mo for 10,000 emails with $1/1K overages. Professional is $75/mo for 100,000 emails at $0.85/1K overages. There's a free tier for testing, though with a 5-day activity log and limited webhook access. For teams that want something reliable without the AWS complexity or the Postmark premium, SMTP2GO deserves a serious look.

Brevo - Best All-in-One

Brevo is a different animal. It's not just a transactional email API - it's an email + CRM + SMS + marketing automation platform. The free tier gives you 300 emails/day (~9,000/month). Starter plans begin at ~$9/mo.

That makes it the obvious pick if you need marketing email alongside transactional, but it's overkill if all you want is SMTP relay for password resets. One annoying detail: branding removal is a paid add-on (commonly $10.80/mo). For pure transactional use, you're better off with Postmark or ZeptoMail.

Mailtrap - Testing + Sending Combo

Mailtrap's unique angle is combining email testing (sandbox, HTML checks, spam analysis) with actual sending. Free tier covers 4,000 emails/month. Paid starts at $15/mo for 10,000 emails, and sending at scale runs ~$85/mo for 100K. In their own controlled benchmark, Mailtrap hit 78.8% inbox placement - decent but behind Postmark and SES.

Mandrill (Mailchimp Transactional)

Mandrill requires an active Mailchimp marketing plan, which immediately makes it the most cumbersome option here. Transactional email runs $20 per block of 25,000 emails (~$80/mo for 100K). There's a non-renewable 500-email trial. Unless you're already deep in the Mailchimp ecosystem, skip this.

Pricing at Every Volume Tier

Here's what each provider costs at three common volume tiers:

*MailerSend 100K: Starter ($35) + 50K overage at $0.95/1K = ~$83.

Free tier breakdown:

*SES free tier is first 12 months only.

Verify Your List Before You Switch

Here's the step everyone skips during an ESP migration: cleaning your list. In our experience, list hygiene accounts for more deliverability improvement than switching ESPs alone. A 98% verified list on a mediocre ESP outperforms a dirty list on the best ESP every time. Every bounce on your new provider damages the sender reputation you're trying to build from scratch.

Prospeo's email verification runs every address through a 5-step process: syntax check, domain validation, mailbox ping, spam-trap removal, and honeypot filtering. It handles catch-all domains too - those tricky addresses that accept everything but may never reach a human. The result is 98% accuracy on verified emails, which directly translates to lower bounce rates on whatever ESP you choose.

The free tier gives you 75 email verifications per month - enough to test the workflow before committing. For bulk verification before a migration, upload a CSV and get results in minutes.

Deliverability Benchmarks

Numbers matter more than marketing claims. Mailtrap ran a controlled test across providers using free-tier accounts, shared IPs, and identical email templates. EmailToolTester paused their benchmarks due to methodology concerns, making Mailtrap's dataset the most current controlled comparison with published methodology.

The results:

• Postmark: 83.3% inbox, 14.3% spam, 0.9% missing
• Mailtrap: 78.8% inbox, 14.4% spam, 2.0% missing
• Amazon SES: 77.1% inbox, 20.0% spam, 1.0% missing
• Mailgun: 71.4% inbox, 23.8% spam, 1.0% missing
• SendGrid: 61.0% inbox, 17.1% spam, 20.9% missing

That SendGrid number is alarming - 20.9% of emails simply vanished. And Mailgun's 23.8% spam rate means almost a quarter of your transactional emails are landing in junk folders.

These are shared-IP, free-tier results. Dedicated IPs with proper warmup will improve every provider's numbers. But the relative ranking tells you something about each platform's default infrastructure quality. The industry average sits at 83.1% - only Postmark meets that bar out of the box.

Pricing Gotchas Nobody Mentions

Let's be honest - most of these gotchas are buried in docs that nobody reads until they get an unexpected invoice. We've compiled the ones that actually bite:

SendGrid's free plan is gone. Retired May 27, 2025. If you had stored contacts on the free tier, they were deleted after a 60-day transition window. The cheapest entry is now ~$19.95/mo.

ZeptoMail credits expire after 6 months. Buy $25 in credits, use $10 worth, and the remaining $15 disappears. Only buy what you'll burn through.

Amazon SES charges per recipient, not per API call. One email to 100 BCC recipients = 100 email charges. This catches teams off guard when sending to distribution lists.

Postmark counts CC/BCC recipients individually. Same concept as SES. A transactional email CC'd to three people costs you 4 emails from your plan, not 1.

Brevo branding removal is a paid add-on. Some plans include Brevo's logo in your emails by default. Removing it is a separate line item - commonly $10.80/mo - that adds up fast.

FAQ

What's the cheapest Mailgun alternative?

Amazon SES at $0.10 per 1,000 emails is the cheapest by raw unit cost, but requires AWS engineering expertise. ZeptoMail at $2.50 per 10,000 emails is the cheapest plug-and-play option - just add SMTP credentials and send.

Is SendGrid still free?

No. Twilio retired SendGrid's free plan starting May 27, 2025. The cheapest paid option is Essentials at ~$19.95/mo for up to 50,000 emails. For free tiers, try MailerSend (500/mo), Brevo (300/day), or Resend (3,000/mo).

Which provider has the best deliverability?

Postmark, at 83.3% inbox placement in controlled testing on shared IPs - matching the 83.1% industry average. Most providers fall well below it: Mailgun tested at 71.4% and SendGrid at 61.0% in the same benchmark.

Do these alternatives work with WordPress, Ghost, or Discourse?

Yes. Any provider offering SMTP relay works with these platforms. Postmark, SMTP2GO, and Brevo all have straightforward SMTP configuration. SES works too but requires AWS setup.

Should I verify my email list before switching ESPs?

Absolutely - bad data causes bounces that tank sender reputation, and a new provider means you're building reputation from zero. Prospeo offers free-tier verification (75 emails/month) so you can validate your workflow before committing to a full migration.