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Toll Free: +1 888 900 4529
| Toll Free: +44 800 088 5522 While dealing with Exchange Server, sometimes users face an Error code 450. In this blog we will learn the method to resolve these kind of error messages. Normally the users face this error when sent message is discarded by the Exchange Server.
1). Sometime users face such kind of error while sending mails because there is a limitation of sending total number of emails that a user can send and is fixed by the administrator of Exchange server
2). Exchange users face this error when mail server rejects the mails sent by the user. Only some of the domains face such kind of issue while others are working fine.
Here the error code 450 indicates that the Exchange server is performing the reverse look ups to identity the address from where you are sending the mail. For better understanding let us consider an Example: Suppose you want to send a mail from abc@domain.com, as you send the mail, your system is stamped with the IP address of your system. Now, when server receives the mail, it first verifies that whether the mail is send through the same domain by verifying its IP address. It checks whether the IP address is pointing to the same domain i.e. abc@domain.com. If server was not able to detect the sender of mail or is not able to identify the hostname, then Error code 450 4.7.1 Client host rejected: cannot find your reverse hostname is encountered.
3).This error is also encountered when the address from where you are sending the email is not valid. This may also happens when you are trying to send email to the user which has been blocked by the Exchange server. In such cases, Error code 450 4.7.1 Recipient address rejected: Access denied error is encountered.
Check the Configuration of Mail server and verify whether domain records of DNS has been setup properly or not.
Verify that you have setup Reverse DNS with a FQDN (not with an ISP). If you don’t have one setup then make contact with ISP and say them to create one connection to the Fully Qualified Domain Name (FQDN). FQDN should always end up with the valid domain name.
If your IP address is blacklisted by the server, then do research and find out the main cause of blocking. IP address are generally marked as blacklisted when they are sending spam link or content. Resolve these issues and request server to remove your IP address from the blacklist.
