Best Mailgun Alternative in 2026: Reloop
Reloop is the open-source Mailgun alternative for 2026: same REST + SMTP surface with self-hosting, $10/50k send-based pricing, and an agent inbox.
Last updated September 17, 2026 · By Reloop Labs
Why teams switch from Mailgun
- $10/mo for 50,000 emails vs $35 Foundation — $0.50 vs $1.30+ per 1k overage
- REST API + SMTP relay with event webhooks and validation
- Agent inbox with spam scoring and threading beyond inbound routes
- Self-hostable Apache 2.0 core for data residency and cost control
- Campaign builder beyond pure transactional sends
- Hosted by Reloop Labs or deploy on your own infrastructure
Full stack
Transactional, campaigns, templates, and contacts in one product.
Self-hosting
Mailgun is hosted-only; Reloop runs on your infrastructure.
Agent-ready
Native inbox APIs for AI workflows Mailgun doesn't offer.
Honest trade-offs
Choose Reloop when…
- You want source access and a self-host exit ramp.
- You send 50k+ emails/month and overage stings.
- You need campaigns, inbound, and agent email in one place.
Stay on Mailgun when…
- Hosted-only simplicity already fits your workflow.
- Volume is low and migration cost outweighs savings.
- Your team lives in Mailgun-native features.
This page is by Reloop Labs, the team behind Reloop. Pricing is public list prices as of September 17, 2026 — verify on reloop.sh/pricing and the competitor's site. Full head-to-head: Reloop vs Mailgun.
Mailgun alternative FAQ
What is the best Mailgun alternative in 2026?
Reloop is the best open-source Mailgun alternative for teams that want the same REST + SMTP surface with self-hosting, $10/month for 50,000 emails vs $35 Foundation, and an agent inbox — hosted or self-hosted from one Apache 2.0 codebase.
Can Reloop replace Mailgun inbound routes?
Yes. Map inbound route URLs to Reloop handlers; the agent inbox adds spam scoring, threading, and triage before webhooks fire — covering reply handling and support-inbox automation.
How much can we save switching from Mailgun?
At 50,000 emails/month: $10 on Reloop Pro vs $35 on Mailgun Foundation. Overage is $0.50 vs from $1.30 per 1,000. Validation and dedicated IPs are add-ons above Mailgun tiers; compare the all-in bill. Prices are public list prices as of September 17, 2026.
Do SMTP senders need code changes?
No — change host, port, and credentials only. API senders need a small client adapter since Reloop is not a drop-in Mailgun proxy.
When should we stay on Mailgun?
Stay if inbound routes, validation add-ons, and current tier pricing already fit your volume with no need for source access or self-hosting.
Replace Mailgun
Drop-in SMTP and REST API migration paths.