If Yahoo Mail delivery. SMTP Yahoo Error issues have been bothering you lately, then this article lebanon telegram data is for you! Yahoo has begun blocking messages that do not meet its latest guidelines . When your Yahoo emails cannot be delivered, Yahoo may send you an error code. Knowing what these Yahoo error codes mean is crucial for quick troubleshooting.
550 error code when Yahoo email bounces
Starting from May 1, 2024, Yahoo email officially began to show the following Yahoo error message in some senders’ emails:
550 5.7.9 This message was blocked because the sender was not authenticated. Yahoo requires all senders to be authenticated using SPF or DKIM.
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What are Yahoo SMTP Error Codes?
An SMTP error code is a numeric response code that displays the results of an email sent via SMTP (Simple Mail Transfer Protocol). SMTP generates codes to communicate the status (success or failure) of a message send. Error codes are usually accompanied by a message describing the error. The message is usually brief and explains why the message was rejected or a problem encountered during transmission.
For example, Yahoo Error Code 421 describes a temporary error due to a blocked service. Yahoo Error Code 554 describes a permanent error due to an authentication failure.
1.4XX (421 and 451) Temporary Error Codes
4XX Error Description
Your Yahoo email may be temporarily blocked due to a temporary error. In this case, Yahoo may send you error codes 421 and 451. Temporary errors will not result in an outright rejection, but they will delay the delivery of your email.
Causes of 4XX Temporary Errors
You may receive a 4XX (421 and 451) Yahoo temporary error code if:
- You keep sending bulk messages from a certain IP, which may taiwan lead cause spam in your Yahoo Inbox
- Yahoo has received a complaint from a recipient regarding your email sending practices
- Connection failure, interruption or temporary unavailability of service