What is an SMTP Error Code?
SMTP, or Simple Mail Transfer Protocol, is the standard protocol for sending and receiving email messages. SMTP error codes are three-digit numerical codes generated by email servers to communicate the status of email deliveries or to report issues encountered during the email transmission process.
These error codes play a crucial role in diagnosing and troubleshooting email-related problems. Below, you'll find a comprehensive list of SMTP error codes, along with detailed descriptions and recommended solutions to resolve them.
List of SMTP Error Codes
Click on each error code to learn more about its description, common root causes, and suggested solutions: