SMTPFlow provides scalable SMTP relay and email APIs that help developers and businesses send transactional and marketing emails with high deliverability.
Send transactional emails securely using our high-performance SMTP infrastructure.
Integrate email delivery into your applications using our RESTful email API.
Track deliveries, opens, clicks, bounces, and complaints in real time.
Automatically process bounce events and maintain healthy sending reputation.
Scale email sending using dedicated IP infrastructure.
Receive real-time event notifications for deliveries, opens, and bounces.
$9
50,000 emails per month
$29
200,000 emails per month
Custom
High volume email senders
Integrate SMTPFlow with your applications using SMTP or our REST API.
POST /v1/send-email
{
"to": "user@example.com",
"from": "support@smtpflow.us",
"subject": "Welcome",
"body": "Hello from SMTPFlow"
}
SMTPFlow is a cloud-based email infrastructure platform built to help developers and businesses deliver transactional and marketing emails reliably. Our platform focuses on deliverability, scalability, and compliance with global email regulations.
Email: support@smtpflow.us
Abuse: abuse@smtpflow.us
Sales: sales@smtpflow.us
Address: 1200 Market Street, Suite 400, San Francisco, CA, USA
SMTPFlow is committed to protecting user data and maintaining strict security practices. Our platform requires all customers to send emails only to recipients who have provided consent. SMTPFlow complies with CAN-SPAM regulations and maintains strong anti-spam monitoring systems. User data is protected using secure cloud infrastructure and industry-standard encryption.
Users of SMTPFlow must only send permission-based email communications. Spam, unsolicited bulk email, or use of purchased email lists is strictly prohibited. SMTPFlow actively monitors abuse reports and complaint rates. Accounts that violate these policies may be suspended or terminated.
SMTPFlow strictly prohibits spam and unauthorized email distribution. All email lists must be permission-based and comply with international email regulations. SMTPFlow monitors bounce rates, complaint reports, and suspicious sending patterns. Violations may result in account suspension and investigation.