It includes three digits and a text part. The numeral section of the code is designed for machine processing, while the text part helps users make sense of the message. The anatomy of SMTP reply codes. The anatomy of SMTP reply codes Below we’ll analyze the most common error types. To see the full list, read our guide highlighting all SMTP error codes and responses. Cracking the code: what does the first digit mean? Each digit in the string of three numbers has a specific meaning — the first one is the most important since it specifies the class of the alert.
marks the class of positive responses. If you see croatia telegram database a reply code that looks like “xx”, it means that a requested action has been completed successfully. A few examples of class codes are “ The server is ready” or “ Closing connection”. marks a class of reply codes stating positive intermediate responses. Simply put, these alert users that the server accepted a command but, due to technical difficulties, the operation is on hold.
You may have seen class reply codes like “ Start mail input end”. While it’s hard to make sense of it, all the code wants to say is that the server has received the data for “To” and “From” fields and is waiting for a sender to specify the body of the message. Reply codes that start with alert users about transient negative replies. This means the server was unable to accept the action or complete a command.