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 Hotmail bounce message 421 RP-001
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Hotmail bounce message 421 RP-001

The mail server IP connecting to Outlook server has exceeded the rate limit allowed. Reason for rate limitation is related to IP/domain reputation. If you are not an email/network admin please contact your Email/Internet Service Provider for help.

Stop all this jibber jabber, what does it mean?

The SMTP server you are using has reputation problems. This can happen because:

Did I do something wrong?

No. The problem resides on the SMTP server of your outgoing email provider.

How can I fix this?

At this point there is not much you can do. This is a temporary problem and will most likely get solved automatically. Either try sending your email again a little later, or contact your SMTP server administrator.