SMTP Relay Service Built for Business

You can be up and running in minutes! After signing up and verifying your email address, you'll be able to add senders and receive SMTP credentials that you can immediately configure in your applications, devices, or systems.

Yes! We automatically handle DKIM signing for all outbound emails and provide detailed guidance on setting up DKIM, DMARC, and SPF records for your domains. This ensures maximum deliverability and helps prevent your emails from being marked as spam.

Our service is designed for legitimate business communications including transactional emails, system notifications, alerts from monitoring systems, scan-to-email from office equipment, and automated reports. We do not allow bulk marketing emails or spam.

No, we only accept business domains and email addresses. Free email providers (Gmail, Yahoo, Hotmail, etc.) are not permitted to ensure service quality and prevent abuse. You must own or control the domain you're sending from in order to properly configure DNS. We use lists of free email providers provided by Hubspot and other sources to enforce this policy. If you feel your domain should be allowed, please contact our team for assistance.

If you approach your monthly limit, we'll notify you via email. Once you reach your limit, additional emails will be queued until the next billing cycle or you can upgrade to a higher plan. We never charge overage fees without prior approval.

We take data security seriously. All information is transmitted over secure channels and emails are not stored on our servers. Once the message has been relayed to its destination, the server deletes the message from the queue. We only store statistics for billing purposes and all payment information is stored securely by our payment processor, Stripe. Access is restricted to authorized personnel only.

Although we use a Mexican domain name, we are a proud American company, Neowyze Technologies, LLC which is registered in the state of Wyoming. Our name "Smarthost.MX" refers to the term "Smarthost" which is commonly used to refer to an SMTP relay server, and ".MX" stands for "Mail Exchanger".

Our email servers are centrally located in the United States, near the rocky mountains, far from hurricanes, earthquakes, tornados and floods. We use secure data centers with redundant power and cooling systems. We have direct interconnects with major ISPs and cloud providers, providing low latency connections to both coasts. We have multiple server clusters with high availability and load balancing configured for maximum uptime.