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Mailgun alternatives for transactional email in 2026

By Tunbosun Ayinla, Founder of Prontuno. Last updated: .

Mailgun is an email API from Sinch, known for inbound routing and email validation.

If you send transactional email only and need a longer message history, the shortlist below covers the main options. Each section also notes where the provider is the weaker choice.

Request access Prontuno vs Mailgun

Reasons to switch

Why teams look beyond Mailgun

Short log retention

Basic keeps 1 day of logs and Foundation keeps 5, which makes older delivery problems hard to investigate.

Look forThirty days of logs without moving up a plan.

One domain on Basic

Basic includes a single sending domain.

Look forSeveral sending domains on the cheapest paid option.

Cost at volume

Sending hundreds of thousands of emails means moving to Scale or paying overages.

Look forHundreds of thousands of emails included at a fixed price.

Side by side

All six alternatives compared

Emails for a $99 monthly budget and how long each provider keeps message history, with Mailgun included for reference.

Mailgun alternatives compared
Provider Emails for $99 Message history Compared with Mailgun
Prontuno

500,000

 30 days 4.1× as many emails as Mailgun for $99
Postmark

79,000

 45 days, with longer retention as an add-on 35% fewer emails than Mailgun for $99
Resend

171,000

 30 days on Free, varies on paid plans 1.4× as many emails as Mailgun for $99
SendGrid

171,000

 3 days on Essentials, 7 days on Pro 1.4× as many emails as Mailgun for $99
Amazon SES

618,750

 Events published to other AWS services 5.1× as many emails as Mailgun for $99
Cloudflare Email Service

271,000

 Metrics and alerts in the Cloudflare dashboard 2.2× as many emails as Mailgun for $99
Mailgun For reference

121,000

 1 day on Basic, 5 days on Foundation, 30 days on Scale —

Mailgun figures come from its published plans. See Mailgun pricing. Amazon SES is shown on Essentials; à la carte sends 990,000 for $99. Checked September 26, 2026.

One by one

Each alternative compared with Mailgun

Prontuno

4.1× as many emails as Mailgun for $99

At $99 · Standard · 500,000 included

Prontuno vs Mailgun 

Best for
Teams sending transactional email at volume who want a fixed monthly price and shared IPs used only by reviewed senders.
Watch out for
Transactional email only, no inbound email yet, no open or click tracking, and every account is reviewed before it can send.
Prontuno compared with Mailgun
Feature Prontuno Mailgun
Emails for $99 500,000 121,000
Message history 30 days 1 day on Basic, 5 days on Foundation, 30 days on Scale
Sending domains 100 per team on credits, 1,000 on Standard and Plus, unlimited on Unlimited 1 on Basic, 1,000 on Foundation and Scale
Dedicated IP Included with Unlimited, warmed and monitored by Prontuno 1 included on Foundation, dedicated IP pools on Scale

Postmark

35% fewer emails than Mailgun for $99

At $99 · Pro · 50,000 included + 29,000 overage

Prontuno vs Postmark 

Best for
Teams that want inbound processing, stored templates, and transactional and broadcast mail in one account.
Watch out for
Costs climb with volume, and Basic allows only 5 sending domains.
Postmark compared with Mailgun
Feature Postmark Mailgun
Emails for $99 79,000 121,000
Message history 45 days, with longer retention as an add-on 1 day on Basic, 5 days on Foundation, 30 days on Scale
Sending domains 5 on Basic, 10 on Pro, unlimited on Platform 1 on Basic, 1,000 on Foundation and Scale
Dedicated IP From $50 a month per IP, for 300,000 or more emails a month 1 included on Foundation, dedicated IP pools on Scale

Resend

1.4× as many emails as Mailgun for $99

At $99 · Pro · 100,000 included + 71,000 overage

Prontuno vs Resend 

Best for
Developers who build email with React Email and want SDKs, inbound email, and marketing from one vendor.
Watch out for
Per-email overages add up at volume, and dedicated IPs need the Scale plan.
Resend compared with Mailgun
Feature Resend Mailgun
Emails for $99 171,000 121,000
Message history 30 days on Free, varies on paid plans 1 day on Basic, 5 days on Foundation, 30 days on Scale
Sending domains 3 on Free, 10 on Pro, 1,000 on Scale 1 on Basic, 1,000 on Foundation and Scale
Dedicated IP $30 a month on Scale, for senders above 3,000 emails a day 1 included on Foundation, dedicated IP pools on Scale

SendGrid

1.4× as many emails as Mailgun for $99

At $99 · Essentials · 100,000 included + 71,000 overage

Prontuno vs SendGrid 

Best for
Larger teams that want transactional and marketing email, validation, and subusers from one established vendor.
Watch out for
Short activity history on smaller plans, and no dedicated IP on Essentials.
SendGrid compared with Mailgun
Feature SendGrid Mailgun
Emails for $99 171,000 121,000
Message history 3 days on Essentials, 7 days on Pro 1 day on Basic, 5 days on Foundation, 30 days on Scale
Sending domains Varies by plan 1 on Basic, 1,000 on Foundation and Scale
Dedicated IP 1 included on Pro and Premier 1 included on Foundation, dedicated IP pools on Scale

Amazon SES

5.1× as many emails as Mailgun for $99

At $99 · Essentials · $0.16 per 1,000 emails

Prontuno vs Amazon SES 

Best for
Teams already on AWS that want the lowest price per email and can build their own event handling.
Watch out for
New accounts start in the sandbox, and delivery events are published to other AWS services rather than an email log.
Amazon SES compared with Mailgun
Feature Amazon SES Mailgun
Emails for $99 618,750 121,000
Message history Events published to other AWS services 1 day on Basic, 5 days on Foundation, 30 days on Scale
Sending domains Verified identities per AWS account and Region 1 on Basic, 1,000 on Foundation and Scale
Dedicated IP $24.95 a month per IP, or managed dedicated IPs 1 included on Foundation, dedicated IP pools on Scale

Cloudflare Email Service

2.2× as many emails as Mailgun for $99

At $99 · Workers Paid · 3,000 included + 268,000 overage

Prontuno vs Cloudflare Email Service 

Best for
Apps already built on Cloudflare Workers with modest sending volume.
Watch out for
Sending is in public beta, new accounts start with a conservative daily quota, and each zone is limited to 30 domains.
Cloudflare Email Service compared with Mailgun
Feature Cloudflare Mailgun
Emails for $99 271,000 121,000
Message history Metrics and alerts in the Cloudflare dashboard 1 day on Basic, 5 days on Foundation, 30 days on Scale
Sending domains 30 per zone 1 on Basic, 1,000 on Foundation and Scale
Dedicated IP Not listed 1 included on Foundation, dedicated IP pools on Scale

FAQ

Questions about Mailgun alternatives

What is the best alternative to Mailgun?
It depends on what you send. For transactional email at a fixed monthly price, Prontuno Standard sends 500,000 emails for $99. For the lowest price per email at most budgets, Amazon SES costs less but needs more setup on AWS. For inbound email or stored templates, Postmark and Resend cover more.
Is Prontuno cheaper than Mailgun?
At a $99 monthly budget, Prontuno Standard sends 500,000 emails and Mailgun sends 121,000. Prontuno sends more at that budget, but Mailgun can cost less at lower volumes. Check your own volume in the pricing calculator. Checked September 26, 2026.
Can I switch from Mailgun without rewriting my code?
If you send over SMTP, yes: only the host, port, and credentials change. Mailgun’s API uses similar field names, from, to, subject, and html, but sends them as form data. Prontuno takes JSON, so each send call needs updating. If your app sends email from one place, such as a mailer class, updating it is usually a small change.
When is Mailgun the better choice?
Mailgun is the better choice if you route inbound email to your application; you validate addresses before sending; you want phone and chat support; or you send marketing and transactional email together.
Do I need a new domain to switch from Mailgun?
No. Add your existing domain to Prontuno and publish the DNS records it generates. They use their own names, so your Mailgun records keep working until you finish switching.
Does Prontuno track opens and clicks?
No, by design. Prontuno sends your links and content exactly as written, so password reset and sign-in links are never rewritten through a tracking domain, and no tracking pixel is added. Delivery, deferral, and bounce events are still reported in your logs and webhooks. To measure clicks, add a parameter to links on your own domain and record it in your app.
Can I send marketing email with Prontuno?
No. Prontuno is for transactional email only, such as password resets, receipts, and account alerts. Every account is reviewed, which keeps marketing mail off the shared IPs. Newsletters and campaigns need a separate provider.

Keep comparing

See all comparisons 

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