Warning: fopen(/domains/smtp-error-codes.info/public_html/bezoekers.log): failed to open stream: Permission denied in /domains/smtp-error-codes.info/public_html/includes/log_bezoeker.inc on line 15 Warning: fwrite() expects parameter 1 to be resource, boolean given in /domains/smtp-error-codes.info/public_html/includes/log_bezoeker.inc on line 16 Warning: fclose() expects parameter 1 to be resource, boolean given in /domains/smtp-error-codes.info/public_html/includes/log_bezoeker.inc on line 17 Yahoo bounce message: 421 4.7.1 [TS03] Permanently deferred
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Yahoo bounce message: 421 4.7.1 [TS03] Permanently deferred

This message indicates Yahoo! is seeing a high volume of emails from your IP address, which is a characteristic of unsolicited, bulk emailing.

Stop all this jibber jabber, what does it mean?

Yahoo believes that you are sending high volumes of spam to Yahoo users and is therefor temporary blocking any email that comes from your IP address.

Did I do something wrong?

Most likely, yes. If you are certain you did not send any spam to Yahoo users, it is possible you have just received a new IP address from your Internet service provider (ISP), that has been used for sending spam by some previous user.

How can I fix this?

Best would be to wait for a few hours before trying to send email again to Yahoo users. If you know you have been sending spam, simply stop sending spam to get rid of this block. This is a temporary problem though that will automatically get fixed over time, unless the spam problem does not get solved.