If you need a reliable SMTP relay but would rather pay with Bitcoin or USDT than hand over a credit card, this guide covers exactly how it works — what you're buying, what to look for, and how a crypto checkout plays out from search to first send.
Why buy SMTP with crypto?
- No credit card needed. Pay with the Bitcoin, USDT or other coins you already hold — handy if you don't have a card that works for international services, or you simply prefer not to use one.
- More privacy at checkout. A crypto payment doesn't hand your card details to another vendor. You still get an invoice and full support — you just skip the card network.
- Fast provisioning. On-chain payments confirm within minutes, and a good provider sets up your relay automatically right after.
What you're actually buying
An SMTP relay is a dedicated sending server your app or mail client hands messages to, which then delivers them on your behalf. New to the idea? Start with what an SMTP relay is and when you need one. The parts that matter are a clean dedicated IP, full SPF, DKIM and DMARC authentication, and a clear daily sending limit.
What to look for before you pay
- A dedicated IP with a clean history — shared IPs inherit other senders' reputation problems.
- Authentication configured for you — SPF, DKIM and DMARC set up at provisioning so you start trusted.
- A stated daily limit — no vague "unlimited" claims; know your headroom per plan.
- Standard ports and access — 587 (STARTTLS) and 465 (SSL/TLS), with SMTP and API access.
- Which coins are accepted — at minimum Bitcoin and USDT; ideally a dozen or more.
How the crypto checkout works, step by step
- Pick a plan that matches your daily volume — our SMTP plans range from 50,000 to 500,000 emails a day.
- Choose your coin at checkout — Bitcoin, USDT (TRC-20 or ERC-20), Ethereum, Litecoin and more.
- Send the exact amount shown to the address or QR code — most wallets let you scan and send in seconds.
- Wait for confirmation — on-chain payments usually confirm within minutes.
- Get your credentials — SMTP host, port, username and password arrive by email with a setup guide. Add the SPF and DKIM records, plug the details into your app, and send a test.
Bitcoin or USDT — which should you use?
USDT is a stablecoin pegged to the dollar, so the amount you send matches the quote with no price swing in between — convenient for an exact invoice. Bitcoin is the most widely held coin and works everywhere. Either is fine; if you want the trade-offs in detail, read USDT vs Bitcoin for paying online.
Get set up
Once you've chosen a plan, the whole process — pay, confirm, receive credentials, authenticate — takes about fifteen minutes. See current SMTP relay pricing, or learn how crypto checkout works before you order.