FAQ

The details, without the runaround.

Everything you might want to know about sending email with MailBlastr, from API setup to deliverability and billing.

Getting started

What is MailBlastr?

MailBlastr is an email platform for developers. Send transactional and marketing emails through a clean REST API.

Do I need a custom domain?

Yes. Add any domain you own, then verify DNS records (DKIM, SPF, DMARC) so mailbox providers trust your mail.

How do I send my first email?

Create an API key, verify a domain, and make one POST request to /emails.

Is there a free tier?

Yes. The Free plan includes 3,000 emails per month (up to 100 per day), 1 verified domain, and 1,000 contacts — no credit card required.

API

What languages do you support?

We offer SDKs for Node.js, Python, Go, Ruby, PHP, Rust, Java, and .NET, plus a CLI. Any language that can make HTTPS requests works.

Can I use SMTP instead of the API?

Not currently. Raw SMTP listeners are intentionally disabled until their hosting architecture is separately approved. Use the HTTPS API today.

Do you support batch sending?

Yes. Send up to 100 emails in a single API call, each fully personalized.

Can I schedule emails?

Yes. Pass a scheduled_at timestamp or use natural language like "in 1 hour".

Deliverability

How do you keep emails out of spam?

We guide you through domain authentication, monitor IP reputation, automatically suppress bounces, and provide deliverability insights.

What are dedicated IPs?

A dedicated IP is an IP address used only by your account. Scale plans can add managed dedicated IPs that warm up automatically.

What happens to bounces and unsubscribes?

They are tracked automatically and excluded from future sends, keeping your reputation healthy.

Do you support BIMI?

Yes. We guide you through setting up BIMI so your logo appears next to your emails in supporting inboxes.

Webhooks & observability

What webhook events do you support?

We send events for sent, delivered, opened, clicked, bounced, complained, unsubscribed, and more.

Can I verify webhook signatures?

Yes. Each webhook request is signed so you can verify it came from MailBlastr.

How long are logs retained?

Free, Pro, and Scale plans include 30-day log retention. Enterprise plans can choose flexible retention.

Plans & billing

Can I cancel anytime?

Yes. Every paid plan is a 30-day term with no long-term contract — your plan stays active through the end of the current term, then you can renew, change plans, or fall back to Free.

What happens if I exceed my limit?

Buy email credits from your dashboard at $0.90 per 1,000 emails. They're consumed automatically once your plan's monthly volume runs out, and they never expire.

Do you offer refunds?

If a paid plan isn’t working out, contact us within 30 days of purchase and we’ll sort out a refund.

Do you have Enterprise plans?

Yes. Contact us for custom volume and pricing, dedicated IPs, flexible AI credits and retention, and SLA-backed support.

Still have a question?

We’re happy to help. Reach out and we’ll get back to you.

Contact support