Mailgun is a long-running transactional email API from Sinch, with strong parsing and routing features, popular with engineering teams since 2010.
Mailgun Foundation charges $35/month for 50,000 emails. MailBlastr covers the same volume on its entry paid plan for roughly 60% less — and the free tier is 3,000/month rather than a 100/day cap with no monthly allowance.
Mailgun keeps message logs for 5 days on Basic and Foundation; you pay $90/month for 30-day retention. Every MailBlastr plan — including Free — retains logs and events for 30 days.
Mailgun is transactional-only; Sinch points marketing use cases at its sister product Mailjet. MailBlastr ships campaigns, audiences, segments, automations, and A/B testing in the same plan as the API.
Mailgun bills overage automatically at $1.10–$1.80 per 1,000. MailBlastr never surprise-bills: when plan volume runs out you consume prepaid credits (or sends pause) — credits cost less and never expire.
If your workload is heavy inbound routing — parsing replies into tickets, complex route rules on incoming mail — or you need an EU-resident sending region today, Mailgun’s routing engine and regional options are genuinely mature.
The free tier (3,000 emails/month) needs no card — you can run the whole migration before paying anything.
Add your sending domain and follow the guided DKIM, SPF, and DMARC setup. One-click flows exist for Cloudflare, GoDaddy, and Namecheap; verification usually completes in minutes.
Replace your current send with one HTTPS request or a typed SDK in 8 languages. Batch endpoints, idempotency keys, and scheduling are built in.
Subscribe a webhook to delivered, opened, clicked, bounced, complained, and unsubscribed events — every request is signed so you can verify the source.
Bring audiences over via CSV or the contacts API; templates port as plain HTML or rebuild in the block editor.
The send call, after the switch
curl -X POST https://www.mailblastr.com/api/emails \
-H "Authorization: Bearer mb_xxxxxxxx" \
-H "Content-Type: application/json" \
-d '{
"domain": "acme.com",
"from": "Acme <hello@acme.com>",
"to": ["ada@example.com"],
"subject": "Welcome to Acme",
"html": "<p>You are in.</p>"
}'| Feature | MailBlastr | Mailgun |
|---|---|---|
| Free tier | 3,000 emails/month (100/day), 1,000 contacts, 1 domain — no card required | 100 emails/day only |
| Entry paid plan | $14/mo — 50,000 emails, 2,500 contacts, 10 domains | $15/mo — 10,000 emails (Basic) |
| 100k emails/month | $24/mo (Pro 100k) · $63/mo (Scale, 1000 domains) | $90/mo (Scale) |
| Extra volume | $0.90 per 1,000 emails — credits never expire | Automatic overage: $1.10–$1.80 per 1,000 |
| Transactional + marketing in one | API sends, campaigns, automations, and audiences in every plan | Transactional only — marketing lives in Mailjet |
| Contacts & audiences | Included on every plan — 1,000 on Free, up to 250,000 on stock plans | No audience/contact management |
| Automations | Included — visual automations, 10,000 runs/month | ✗ |
| A/B testing | ✓ | ✗ |
| Inbound receiving | ✓ | Routing + parsing (strong) |
| Event webhooks | Signed webhooks: delivered, opened, clicked, bounced, complained, unsubscribed | ✓ |
| Official SDKs | 8 languages + CLI | SDKs for major languages |
| Log retention | 30 days on every plan | 5 days (Basic/Foundation) · 30 days on Scale |
| Dedicated IP | Add-on on Scale — $21/30 days | Scale plan and above |
| INR billing for India | ✓ | ✗ |
Mailgun pricing and features summarized from public pricing pages, last checked 2026-08-02. MailBlastr figures come from the live plan catalog.
Want the row-by-row breakdown? See the full MailBlastr vs Mailgun comparison.
At 50,000 emails/month: Mailgun Foundation is $35; MailBlastr covers it for about 60% less. At 100,000: Mailgun Scale is $90; MailBlastr’s Pro 100k and Scale plans are both far below that (Scale adds 1,000 domains and the dedicated-IP add-on).
Mailgun keeps 5 days of logs until you buy Scale ($90/month, 30 days). MailBlastr keeps 30 days of email and event history on every plan, including Free.
No — Mailgun is a transactional API; Sinch sells Mailjet for marketing. MailBlastr includes campaigns, audiences, automations, and A/B testing alongside the API in one plan.
MailBlastr includes inbound receiving per domain with webhook delivery of parsed messages. Mailgun’s routing rule engine is more configurable — if complex inbound routing is your core workload, that is Mailgun’s home turf.
Verify your domain, replace the messages API call with POST /emails (or one of 8 SDKs), and re-point webhooks — the event vocabulary (delivered, opened, clicked, bounced, complained, unsubscribed) maps one-to-one.
Free tier with 3,000 emails a month — API, campaigns, automations, and webhooks included. No card required.