Send system-critical emails with speed, security, and precision.
Mailstacker is a US-based cloud messaging infrastructure provider focused on secure and reliable transactional email delivery. Our platform is engineered for system-generated communications such as authentication, alerts, and account notifications.
We prioritize compliance, monitoring, and abuse prevention across all services.
Transactional Email Delivery
SMTP Relay Service
RESTful Email API
OTP & Notification Systems
Delivery Tracking & Logging
Email: support@mailstacker.us
Abuse: abuse@mailstacker.us
Address: Delaware, United States
We respect user privacy and do not sell personal data. Data is processed only as necessary to deliver transactional email services securely.
Users are strictly prohibited from sending spam, unsolicited messages, phishing, or abusive content. We comply with CAN-SPAM and GDPR principles.
Mailstacker is for transactional emails only. Bulk messaging, marketing campaigns, and purchased lists are strictly prohibited.