StackSMTP uses clean IPs, authentication protocols, and deliverability intelligence to maximize inbox placement for every email you send.
No special apps or interfaces required — just connect and send using standard SMTP.
We maintain trusted IPs and clean reputation to ensure your emails land in inboxes — not spam.
From 25,000 to 1 million emails per month, our servers scale with your needs.
Plug into any email client, cPanel, or Plesk, CMS, app — including WordPress, CRM systems, or custom apps.
TLS encryption, DKIM, SPF, and DMARC-ready.
Our team is here to support you around the clock, with real people.
Track opens, clicks, bounces, and delivery status in real time.
An SMTP relay service allows you to send outbound emails using a trusted third-party mail server. It helps ensure better deliverability, scalability, and compliance for transactional, marketing, and notification emails.
Yes, but only to compliant, opt-in recipient lists. High-volume bulk marketing is allowed on certain plans, and anti-spam policies must be followed strictly.
Absolutely. All plans include access to technical support via Ticket System. Higher-tier plans come with priority or 24/7 support options.
You’ll receive a notification when approaching your quota. If the limit is exceeded, emails may be queued or temporarily paused until your quota is upgraded or reset. Upgrades are seamless and instant.
Yes. All accounts come with full support for SPF, DKIM, and DMARC records to help authenticate your domain and protect your emails from spoofing.
Integration is simple and takes only a few minutes. You’ll receive SMTP credentials which you can configure in your application, cPanel, Plesk, Direct Admin, CMS (e.g. WordPress), CRM, or email client. Full documentation and setup guides are available in the dashboard.
SMTP relay services are ideal for:
- SaaS platforms and web applications
- E-commerce websites
- Enterprises and corporate IT teams
- Marketing agencies
- Any system that sends large volumes of automated emails
