In today's digital world, email is an indispensable part of everyday communication, whether for personal or professional purposes. However, sometimes a sent email fails to reach the recipient and is returned to the sender with an error message. These error messages are known as "bounced emails." In this article, we'll look at the most common error messages that can occur when sending emails and try to explain them in detail.
1. 550 5.1.1 User unknown This error message means that the recipient's email address does not exist or has been terminated. Make sure the address was entered correctly and does not contain any typos.
2. 451 Temporary local problem – please try later This message indicates a temporary issue on the recipient's server. It could be due to server overload or temporary unavailability. It is recommended to try sending the email again later.
3. 550 5.7.1 Unable to relay The error message signifies that the sender's server is not authorized to send emails to the recipient's server. This issue may be caused by incorrect SMTP server settings or missing credentials for authentication.
4. 421 Service not available, closing transmission channel This message informs about the temporary unavailability of the email service, which could be due to server maintenance or technical issues. Try sending the email again at a different time.
5. 554 Transaction failed A general error message that may indicate a range of problems from message rejection due to suspected spam to technical issues on the server. For detailed diagnostics, it is recommended to contact the email service provider.
6. 452 Too many recipients This message indicates that you are trying to send an email to too many recipients at once. Some servers have limitations on the maximum number of recipients to prevent spam.
7. 552 Storage allocation exceeded The recipient's mailbox is full and cannot accept any more messages. The user should free up space in their mailbox to receive new emails.
8. 533 Authentication required This message appears if the sender's email server requires authentication, but the email was not sent with the necessary authentication credentials. Check the settings of your email client.
The above error messages represent only a portion of the possible issues that can occur when sending emails. It is important to carefully read error messages and take appropriate action accordingly. In some cases, consulting with the IT department or email service provider may be necessary to address specific technical issues.
