5 best Mailgun alternatives for transactional email in 2026
Five Mailgun alternatives (Lettr, Mailtrap, Postmark, Amazon SES, and Twilio SendGrid) compared on log retention, free tiers, pricing at 50,000 and 100,000 emails a month, and traffic separation.
This article compares five Mailgun alternatives on log retention, free tiers, pricing, and traffic separation, and covers what each one is good at. The comparison starts from two Mailgun limits: the Free and Basic plans keep message logs for exactly one day, and pre-send address validation stays a paid add-on until the $35-a-month Foundation plan, which includes only 5,000 validations.
The best Mailgun alternatives for transactional email in 2026 are Lettr, Mailtrap, Postmark, Amazon SES, and Twilio SendGrid.
One disclosure: Lettr is our product. Every price and claim here was checked against each provider's own site or documentation at the time of publication.
Best Mailgun alternatives compared
| Provider | Best for | Free tier | 50,000/mo | 100,000/mo | Traffic separation |
|---|---|---|---|---|---|
| Lettr | Full toolkit with marketing built in | 3,000/mo, permanent | $15 | $30 | Transactional and marketing on separate streams |
| Mailtrap | Built-in traffic isolation | 4,000/mo (150/day cap), permanent | $20 | $30 | Isolated IP pools for transactional and bulk, every plan |
| Postmark | Delivery speed | 100/mo, permanent | ~$68.50 | ~$133.50 | Message Streams split by traffic type |
| Amazon SES | Lowest cost per email | $200 AWS credit, first 12 months | ~$5 | ~$10 | Manual, via config sets |
| Twilio SendGrid | Existing Twilio customers | None | $19.95 | $34.95 | Manual, via IP pools or subusers |
1. Lettr: full sending toolkit with marketing built in
Lettr is a transactional email platform built as one account instead of several. An email API and SMTP relay sit next to a drag-and-drop template editor, per-email analytics, and marketing campaign tools, so a developer sets up sending once and a marketer runs campaigns from the same login afterward.
Key features
Lettr's sending infrastructure comes from Ecomail, its sister company and a major email provider with more than a decade of delivery history. Bounces and complaints are suppressed automatically, six major blocklists are monitored continuously, and dedicated IPs ramp up their own sending volume without a manual warmup schedule. SPF, DKIM, and DMARC setup runs through a guided flow that checks each record the moment it's added, so a misconfiguration surfaces before it costs deliverability.
Templates are built in Topol, the included editor, which supports conditional logic and reusable snippets, so a copy change doesn't need a code deployment. Statistics are kept per message rather than rolled into daily counters: each email carries its own searchable record of opens, clicks, bounces, and delivery state for 10 days, against Mailgun's one-day window on Free and Basic. Click tracking runs on a domain tied to your own brand rather than a shared Lettr link.
Official SDKs cover Node.js, PHP, Python, Go, Rust, and Java, with a first-class Laravel package on top, and an MCP server gives coding assistants access to template and send management.
Pricing
The free tier is 3,000 emails a month with no expiration date. Past that, 50,000 emails a month cost $15 and 100,000 cost $30, less than half of what Mailgun charges for the same volumes on its Foundation and Scale plans. Full tiers are on Lettr's pricing page.
The tradeoff: Lettr is the youngest product in this lineup. It runs on infrastructure with a long history, but the platform itself hasn't been on the market as long as the other four.
2. Mailtrap: native stream separation
Mailtrap is a sending platform whose Email API and SMTP relay keep transactional and bulk traffic on separate IP pools automatically, including on the free plan. On Mailgun, separating traffic types means setting up your own subdomains.
Key features
Eight official SDKs (Node.js, PHP, Ruby, Python, Java, .NET, Go, and Elixir) get a working integration live in about five minutes, with Laravel and Symfony support built as add-ons on the PHP SDK. For teams building with AI coding tools, an MCP server exposes 76 tools, and seven downloadable agent skills cover specific jobs such as authorizing API requests and configuring a new sending domain.
Delivery data breaks down by mailbox provider and by sending stream. Every account also gets a free transactional SMTP service, so production email can go out over plain SMTP before any SDK is integrated. Authentication configures itself: once the DNS records are in place, SPF, DKIM, and DMARC activate on their own, DKIM keys rotate monthly, and Mailtrap's DMARC verification tool catches a broken record early.
Log windows scale with the plan: three days on Free, five on Basic, 15 on Business, and 30 on Enterprise. Even the free window is longer than Mailgun's, and Business already beats Mailgun's five-day ceiling on Foundation.
Pricing
Free covers 4,000 emails a month, capped at 150 a day. Basic runs $20 for 50,000 emails and $30 for 100,000. Business costs $85 a month at 100,000 emails and adds a self-warming dedicated IP, single sign-on, and round-the-clock priority support. Enterprise starts at $750 a month for up to 1.5 million emails.
The tradeoff: 24/7 support is a Business-plan feature. Free and Basic accounts get email support on weekdays.
3. Postmark: delivery speed
Postmark is a transactional email service that has optimized for one thing for more than a decade: getting mail to the inbox fast. New accounts go through a manual review before sending goes live, an extra signup step that keeps its shared sending pools clean.
Key features
Message Streams keep transactional, broadcast, and inbound mail on separate infrastructure by default, where Mailgun leaves you to build the same split through subdomains. Activity logs stay for 45 days, the longest of any option in this comparison, and bounce classification and suppression work without extra configuration. Official libraries cover Node.js, PHP, Python, Ruby, .NET, Java, and Go.
Pricing
The Developer plan is free permanently for 100 emails a month. Paid tiers price 50,000 emails at roughly $68.50 and 100,000 at roughly $133.50. A dedicated IP is a $50-a-month add-on on the Pro plan, available once an account sends more than 300,000 emails a month.
The tradeoff: costs rise quickly past the entry tier, and according to recent reviews, account approval has become stricter since the ActiveCampaign acquisition.
4. Amazon SES: lowest cost per email
Amazon SES is AWS's sending service, priced like raw infrastructure. It is the cheapest option in this comparison and covers sending only, which leaves templates, dashboards, and suppression logic to the team using it.
Key features
SES has no template builder or analytics dashboard, and stream separation isn't automatic. Bounce and suppression logic gets assembled from surrounding AWS services: SNS for notifications, Lambda for processing, and CloudWatch for monitoring. New accounts start in a sandbox limited to 200 emails a day until AWS approves a production request. Virtual Deliverability Manager adds dashboards and reputation tracking, but as a paid extra.
Pricing
AWS dropped the standing free allowance for new accounts. In its place is a one-time credit of up to $200, usable across AWS services including SES, which expires 12 months after signup. Past that, 50,000 emails cost roughly $5 and 100,000 roughly $10. A dedicated IP adds $24.95 a month on top of the base rate.
The tradeoff: the engineering hours needed to build bounce handling, suppression, and reporting from scratch typically cost more in year one than the lower per-email rate saves.
5. Twilio SendGrid: consolidate under one vendor
SendGrid became part of Twilio in 2019, and its site now lives entirely on twilio.com. For a team already billing SMS, voice, or identity verification through Twilio, email goes on the same invoice instead of a separate Mailgun account.
Key features
Official libraries cover Node.js, PHP, Python, Ruby, Java, Go, and C#, and dynamic templates use Handlebars for personalized sends. Activity logs last about 30 days on paid plans, longer than on Mailgun's Foundation tier, and failed webhook deliveries retry for 24 hours. Traffic separation isn't part of the default setup: teams that want it configure IP pools or subuser accounts manually, a workaround similar to Mailgun's subdomain approach.
Pricing
There's no free tier. Essentials costs $19.95 a month for 50,000 emails and $34.95 for 100,000. Pro, at $89.95, is the tier that adds a dedicated IP, and Premier is quoted case by case for larger senders.
The tradeoff: support response times come up often enough in G2 reviews to be worth a look before committing, especially for teams with strict incident-response expectations. For the other direction, see our SendGrid alternatives comparison.
FAQ
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Bottom line
The right Mailgun replacement depends on what prompted the search. Lettr, Mailtrap, and Postmark all fix the short log window, and Lettr and Mailtrap do it without Postmark's prices: Lettr with per-message analytics and marketing tools in the same account, Mailtrap with traffic isolation on every plan. Postmark suits teams whose support load depends on fast delivery. Amazon SES makes sense when the invoice matters most and engineering time is available, and Twilio SendGrid fits teams already paying Twilio for SMS or voice. Whichever one replaces Mailgun, check log retention and validation coverage against actual sending volume, not the numbers on the entry-tier plan.
To try Lettr, create a free account; the 3,000-email free tier doesn't expire. The email history docs cover how the per-message records work.