421 CON:B1 The IP address has been temp failed due to a spike in unfavorable e-mail statistics. 421 DNS:NR The Reverse DNS lookup for your IP address is failing. This could be a transient issue. Confirm the IP that sends your mail. Then check the rDNS of that IP using our troubleshooting tools. If it … Continue reading Different Types of AOL SMTP Error Codes.
Look at below mentioned Hotmail SMTP or Bounce Message Error Codes: Error codes starting with 4XXX are temporary errors. Error codes starting with 5XXX are permanent/fatal errors: 421 RP-001 The mail server IP connecting to Microsoft Hotmail server has exceeded the rate limit allowed. Reason for rate limitation is related to IP/domain reputation. If you … Continue reading Know about Hotmail SMTP Error Codes.
One of the best email programs in the world is the Gmail and many organizations depend on its emailing program to communicate within their organization. Google provides its email servicing for free to its users and also provides various other features to its customers. For doing anything on the internet you definitely need a Gmail … Continue reading Gmail error code 007 and Troubleshooting Steps.