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Not sure what an SMTP error code means? You’re not alone. It can be shocking and confusing to see SMTP errors sometimes, and we want to eliminate the confusion with a quick-and-easy explanation.
Below, we’ll explain everything you need to know about SMTP error codes, including short explanations of common ones you’ve likely seen before.
Within the SMTP process, messages are relayed from one computer to another via SMTP servers. SMTP servers send response codes that indicate what has happened to messages.
While messages are usually sent without issue, different server response codes can indicate various things.
Below are a handful of SMTP server response codes that we’ve compiled that you might see when sending emails.
There are a variety of issues that can trigger these SMTP server responses, and you’re not expected to know how to handle all of them. SendGrid’s amazing support staff is here to help you figure out what went wrong and what you can do to correct it.
To learn more about these and other SMTP server responses, read our Knowledge Base article. The article provides examples of all these responses as well as offers suggestions for correcting any problems.
Sending email involves multiple computers communicating with each other through a process call Simple Message Transfer Protocol (SMTP). SendGrid functions as an SMTP relay service to send billions of marketing and transactional emails every month.
Sign up for a free account (no credit card required) to start sending!
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