ZeptoMail is Zoho’s transactional-only email service with pay-as-you-go credit pricing, popular with cost-conscious teams — especially in India.
ZeptoMail’s policy prohibits bulk, promotional, and marketing sends — accounts get suspended for it. The moment you need a newsletter, product announcement, or drip sequence, Zoho points you to a second product (Zoho Campaigns). MailBlastr runs transactional and marketing on one platform, one audience store, one bill.
ZeptoMail credits lapse after 6 months. MailBlastr credits have no expiry — and plans include a monthly allowance, so routine volume never touches credits at all.
Audiences, segments, topics, visual automations, A/B testing, polls, AI template generation, and per-recipient analytics are all included. ZeptoMail deliberately stays a minimal transactional pipe.
MailBlastr has native INR pricing like Zoho does, so Indian teams can compare on capability: for the price of a few thousand extra transactional emails, MailBlastr adds the entire marketing and automation layer.
If you send purely transactional email at low, spiky volume and want the absolute lowest bill — or you live inside the Zoho suite — ZeptoMail’s pay-as-you-go credits are genuinely hard to beat. Just keep marketing email somewhere else, because Zoho enforces the ban.
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 | ZeptoMail |
|---|---|---|
| Free tier | 3,000 emails/month (100/day), 1,000 contacts, 1 domain — no card required | First 10,000 emails free (one credit) |
| Entry paid plan | $14/mo — 50,000 emails, 2,500 contacts, 10 domains | $2.50 per 10,000-email credit |
| 100k emails/month | $24/mo (Pro 100k) · $63/mo (Scale, 1000 domains) | ≈$25 in credits — transactional only |
| Extra volume | $0.90 per 1,000 emails — credits never expire | Buy more credits (expire in 6 months) |
| Transactional + marketing in one | API sends, campaigns, automations, and audiences in every plan | Transactional ONLY — marketing email prohibited |
| Contacts & audiences | Included on every plan — 1,000 on Free, up to 250,000 on stock plans | ✗ |
| Automations | Included — visual automations, 10,000 runs/month | ✗ |
| A/B testing | ✓ | ✗ |
| Inbound receiving | ✓ | ✗ |
| 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 | 60 days content retention (configurable window) |
| Dedicated IP | Add-on on Scale — $21/30 days | Available as add-on |
| INR billing for India | ✓ | ✓ |
ZeptoMail 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 ZeptoMail comparison.
If 100% of your email is transactional and volume is low, ZeptoMail wins on price and that is the honest answer. Teams switch when they also need marketing sends (banned on ZeptoMail), audiences, automations, or analytics — capabilities that would otherwise mean adding and integrating Zoho Campaigns as a second product.
No — Zoho explicitly prohibits bulk and promotional email on ZeptoMail and suspends accounts that try. MailBlastr supports both transactional and marketing sending with per-domain reputation isolation.
No. ZeptoMail credits expire 6 months after purchase; MailBlastr credits never expire, and every plan already includes a monthly email allowance before credits are touched.
Yes — native INR pricing for Indian customers on every plan and on credits, no USD card or FX mark-up required.
Verify your domain (guided DKIM/SPF/DMARC), swap the send call to POST /emails or one of 8 SDKs, and re-point webhooks. Mail Agents map to sending domains; templates port as HTML.
Free tier with 3,000 emails a month — API, campaigns, automations, and webhooks included. No card required.