MailStack helps developers and businesses send reliable application emails such as password resets, account notifications, and system alerts using a secure transactional email delivery platform.
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Delivery Rate
Bounce Rate
API Requests
Send application emails easily using our secure SMTP relay infrastructure.
Integrate transactional email sending directly into your apps using our REST API.
Track delivery performance, open events, and message status in real time.
Monitor bounced emails and feedback loops to maintain high sender reputation.
Receive real-time events when emails are delivered, opened, or bounced.
Create reusable templates for transactional emails and notifications.
Send secure verification emails during user registration.
Deliver instant password reset emails for application users.
Ecommerce systems use MailStack for purchase confirmation emails.
Send account security notifications and login alerts.
Notify users about updates and important application events.
MailStack provides a flexible email API and SMTP relay for developers to integrate reliable transactional email sending into applications, SaaS platforms, and backend services.
POST /v1/send
{
"to": "user@example.com",
"subject": "Password Reset",
"template": "reset_password"
}
Up to 5,000 emails / month
Email API
SMTP relay
Up to 100,000 emails
Analytics
Webhooks
High volume delivery
Dedicated support
Advanced analytics
support@mailstack.us
info@mailstack.us
abuse@mailstack.us
MailStack only supports permission-based email sending. Users must obtain explicit recipient consent before sending emails.
Spam, purchased email lists, and unsolicited bulk marketing emails are strictly prohibited.
All emails sent through MailStack must contain proper identification and unsubscribe functionality where applicable.
MailStack protects customer data and email content according to industry best practices.