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API, SMTP & integrations — Page 2
Developer material: REST API, SMTP relay, webhooks, SDKs for PHP, Node, Python and Go, and integration recipes.
API, SMTP & integrations
4 min
Soft Bounce vs Hard Bounce: The Difference and Fixes
Understand soft bounce vs hard bounce: SMTP codes, retry logic, suppression lists and safe bounce-rate thresholds. Read the docs → API, SMTP & integrations 5 minSMTP service for bulk email: choose and set up
SMTP vs API, ports 587 and 465, STARTTLS, selection criteria and a five-minute relay setup. Read the docs → API, SMTP & integrations 5 minHow to configure an SMTP relay: step by step
Host, port, user and pass, TLS, testing with swaks and openssl, DKIM and the 535/550/554 errors explained. Read the docs → API, SMTP & integrations 4 minSMTP Relay vs Email API: Which Should You Use?
SMTP relay or HTTP Email API? Compare compatibility, speed, features and portability — and learn when to use each (or both) for sending email. Read the docs →Start sending in minutes
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