Mailgun Alternative
The Best Mailgun Alternative for Every Email You Send
Compare Keplars and Mailgun on setup, sandbox limits, pricing, and features. No authorized-recipient sandbox, built for both transactional and marketing email.
Why Teams Look For a Mailgun Alternative
Mailgun has a strong reputation among developers for its email API and deliverability tools. As teams grow, they often need capabilities Mailgun does not offer: OAuth sending without a sandbox, marketing campaigns, AI-powered templates, mailbox warmup, and a free tier that does not run out every day.
- No Sandbox Recipient Restrictions
Mailgun's sandbox domain only sends to email addresses you manually authorize one at a time, until you verify your own domain. Keplars lets you authenticate via Gmail, Google Workspace, or Outlook through OAuth and send to any real inbox from day one.
- Transactional and Marketing Together
Mailgun is built around transactional delivery with no native marketing product. Keplars handles both transactional emails and marketing campaigns from the same platform, no separate tool required.
- A Free Tier That Actually Lasts
Mailgun's free plan caps out at 100 emails per day with ticket-only support. Keplars gives you 5,000 emails free every month with the same support as every other plan.
Mailgun vs Keplars Feature Comparison
A side-by-side look at setup, restrictions, features, and pricing.
| Feature | Keplars | Mailgun |
|---|---|---|
| Getting Started | Sign up and start sending in minutes | Sandbox domain for testing, or verify your own domain before production sending |
| OAuth Email Sending | Gmail, Google Workspace & Outlook supported | Not supported (API & SMTP only) |
| Sandbox Restrictions | None. Send to real inboxes immediately | Sandbox limited to pre-authorized recipients only |
| Free Tier | 5,000 emails every month | 100 emails/day |
| SMTP Support | SMTP with STARTTLS & REST API | SMTP & REST API |
| Transactional Emails | Included | Included |
| Marketing Campaigns | Built-in campaign platform | No built-in marketing campaign management |
| Visual Email Builder | Drag & drop editor with code mode | Basic email template builder |
| AI Email Templates | Built-in AI template generation | Not available |
| Workflow Automation | Visual workflow builder with conditions, delays, actions & webhooks | Not available |
| Audience & Contact Management | Contacts, audiences, tags & custom attributes | Basic mailing lists only |
| Mailbox Warmup | Built-in mailbox warmup | Not available |
| Real-Time Tracking | Opens, clicks, deliveries, bounces & event timeline | Opens, clicks, deliveries & events |
| Domain Authentication | Guided SPF, DKIM & DMARC setup with OAuth support | Manual SPF, DKIM & DNS configuration |
| Pricing | Usage-based pricing starting at $5/month | Starts at $15/month (10,000 emails included) |
| Support | Responsive support across all plans | Ticket support on lower plans, priority support on higher tiers |
Why Teams Choose Keplars Over Mailgun
OAuth Email Sending
Send from Gmail, Google Workspace, or Outlook via OAuth. Your real inbox reputation powers every email with zero DNS setup.
No Sandbox Recipient Limits
Send to any real inbox from day one. Mailgun's sandbox only allows pre-authorized recipients until you verify your own domain.
AI-Generated Templates
Generate polished, responsive email templates with AI. Mailgun's template builder is code-based with no visual editor.
Visual and Code Email Editor
Drag-and-drop and code editing in one unified tool. Switch between visual and code mode without losing work.
Marketing Campaigns
Run broadcast campaigns and lifecycle flows alongside your product emails. Mailgun has no native marketing or audience product.
Mailbox Warmup
Automatically warm up new sending domains and mailboxes to build reputation before sending at full volume.
Unified Analytics Dashboard
Real-time opens, clicks, bounces, and delivery events sit alongside your contacts and campaigns in one dashboard.
Better Free Tier
5,000 emails per month on the free plan versus Mailgun's 100 per day. Far more headroom to build and test before you ever pay.
Built for Modern SaaS Applications
Every email type your product needs, handled from one platform.
Welcome emails and account setup sequences delivered reliably from day one.
Secure, branded password reset links delivered instantly to your users.
One-time password codes that arrive in under 5 seconds, every time.
Email address confirmation flows that complete fast and land in the inbox.
Passwordless login links sent and received in seconds for frictionless auth.
Invoices and receipts as HTML or PDF delivered straight to customer inboxes.
Trial expiry, renewal reminders, and subscription change confirmations.
Broadcast campaigns and drip sequences sent from the same platform as your product emails.
Email Infrastructure Beyond Transactional Emails
Mailgun is a transactional email delivery platform. Keplars is a complete email platform. Manage everything from a single dashboard.
- Transactional Emails
APIs and SMTP for OTPs, resets, invoices, and all product-critical email.
- Marketing Emails
Broadcast campaigns and lifecycle email flows from the same platform.
- Templates
AI-generated, drag-and-drop, and code editor. All in one unified interface.
- Automations
Trigger-based email workflows with branching logic and delay controls.
- Real-Time Tracking
Open time, delivered time, click time, and full event timelines per email.
- Domains and Analytics
Manage sending domains, SPF, DKIM, DMARC, and a live analytics dashboard in one place.
How to Migrate From Mailgun to Keplars
No sandbox, no authorized recipients. Most migrations take under 30 minutes.
Sign up at dash.keplars.com and create a new project. Takes under a minute.
Authenticate via OAuth with Gmail or Google Workspace, or add your custom domain with auto-managed DNS records.
Swap out the Mailgun SDK for the Keplars SDK and update your API key. Method names and field names differ slightly.
Copy your existing HTML templates or rebuild them with the AI-powered Keplars editor and visual designer.
Remap Mailgun event names (delivered, opened, permanent_fail) to Keplars dot-notation events (email.delivered, email.opened, email.bounced).
Before vs After
const formData = require("form-data");
const Mailgun = require("mailgun.js");
const mailgun = new Mailgun(formData);
const client = mailgun.client({
username: "api",
key: process.env.MAILGUN_API_KEY,
});
await client.messages.create("yourdomain.com", {
from: "[email protected]",
to: ["[email protected]"],
subject: "Welcome!",
html: "<h1>Welcome aboard</h1>",
});import { Keplars } from '@keplars/sdk';
const keplars = new Keplars({
apiKey: process.env.KEPLARS_API_KEY,
});
await keplars.emails.sendInstant({
to: ['[email protected]'],
subject: 'Welcome!',
html: '<h1>Welcome aboard</h1>',
is_html: true,
});Webhook event name mapping
Mailgun uses its own event names. Keplars uses lowercase dot-notation. Update your webhook handler event checks accordingly.
Templates, contact lists, and domain settings all carry over. Full details in the migration guide.
Why Startups Choose Keplars
- Scalable Infrastructure
Built to grow with your product. Start free, scale to millions of emails without re-architecting your email stack.
- Developer Experience First
Clean REST APIs, clear documentation, a developer CLI, and predictable behavior that feels natural in real production workflows.
- Transactional and Marketing Together
Stop running separate tools for product emails and marketing campaigns. Keplars handles both from a single dashboard.
- Analytics That Actually Help
Real-time open rates, click rates, delivery timelines, and bounce tracking. Know what happened to every email you sent.
- Automations Without Extra Cost
Trigger-based email workflows, drip sequences, and re-engagement flows are included. No additional tool or tier required.
- One Platform for Everything
APIs, SMTP, webhooks, templates, automations, tracking, domains, and analytics in one place. No tool sprawl.
Frequently Asked Questions
Ready to switch from Mailgun?
Disclaimer: Comparisons are provided for informational purposes only and are based on publicly available data at the time of publication.
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