SMTP relay
A standards-compliant SMTP relay hosted in the EU. Drop it into WordPress, Laravel, Rails, nodemailer, or any SMTP client, and keep full tracking and webhooks.
Standard SMTP, any client
STARTTLS on port 587 and implicit TLS on port 465. Works with WordPress, Laravel, Rails, nodemailer, Django, Python smtplib, and every AI-agent framework.
Tracking, parity with the API
Open and click tracking, webhooks, suppressions, and bounce handling behave identically whether you send over REST or SMTP.
One credential to manage
Use your PostStack API key as the SMTP password. Rotate it from the dashboard and every SMTP client updates at once.
SMTP configuration
bash
# SMTP Settings
Host: smtp.poststack.dev
Port: 587 (STARTTLS) or 465 (TLS)
Username: poststack
Password: sk_live_your_api_key
# Example with swaks
swaks --to user@example.com \
--from hello@yourdomain.com \
--server smtp.poststack.dev:587 \
--auth LOGIN \
--auth-user poststack \
--auth-password sk_live_...