SMTP error codes are typically 3-digit codes used by the. Understanding SMTP server when a switzerland telegram data message fails to be sent. They help understand why a sending attempt failed.
If you own a website, these error codes can seriously affect the normal operation of your website’s email system. If your SMTP server keeps displaying error messages, customers may not be able to contact you. This can potentially lead to a decrease in your website’s popularity.
How to read SMTP error codes
An SMTP error code consists of three digits, and their meanings are as follows.
Error code category
The first number indicates that the server accepted the command. The server attempted to perform the operation but encountered an error. Its value range is 1 to 5.
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The second number in the error code provides details about the type of problem, such as a syntax problem or a connection problem.
Details
The third digit in the error code gives specific details about the status how to build your email list for free of the message transfer.
Classification of SMTP error codes
Common SMTP error codes and messages
There are several types of SMTP error messages. These error messages are explanations of the error codes. They explain why a particular code occurred. They also include suggestions on how to resolve the problem.
Code 101
SMTP code 101 means that the server is currently unable to establish a connection.
Rechecking and correcting the server name may trust review resolve the issue. It may be a typo.
Code 221
Code 221 indicates that the server is terminating its transmission channel. The message MUST NOT be accompanied by any other closing words.
In an email conversation, this message simply means that the email has been processed, but the conversation is ending.
Code 354
The message with error code 354 might be somewhat cryptic. It often appears as “Start mail input end <CRLF>.<CRLF>.” This is the standard response to the Data command.
It indicates that the server has received the From and To details of the email and is ready to receive the body information.
Code 421
SMTP code 421 means the service is unavailable. This could be due to connectivity issues with the server or any other temporary problem.
The server is not available right now. This could be a problem on the sender’s or recipient’s side. Please try to send the email again when the server is functioning normally.