DNS Reverse Lookup Failed

Error:  Task 'me@mydomain.com ' Sending reported error: 'The server responded: 550 This system is configured to reject mail from 999.999.999.999 [999.999.999.999] (DNS reverse lookup failed)'

Description: You receive this error message when attempting to send mail through the Host Depot Email servers. The Host Depot email servers use Reverse DNS lookups to verify the sender.  This helps with the amount of SPAM allowed in.  


Solution: What you need to do is talk to the entity responsible for maintaining your public DNS.  This is normally your ISP.  What you want in the public DNS is a PTR record.  This associates your public IP address  with a FQDN.  You want the domain name portion of the FQDN to match what your sending SMTP addresses contain. 

Was this answer helpful?

 Print this Article

Also Read

How do I setup Eudora to read my e-mail?

Follow these steps: Open Eudora. Click the Tools menu and then click Options...  ...

Why can't I receive very large files in my email.

Our mail servers will allow up to 25 MB for incoming and outgoing email messages. This is...

When I connect to my Microsoft Access database, I receive the error message catastrophic failure.

Symptoms I receive an error similar to the following: Provider error '8000ffff' Catastrophic...

What is the PERL mail path?

The PERL physical mail path on most web servers is c:\components\sendmail\sendmail.exe.

Where can I find information about building web pages for WAP?

The following sites have information regarding developing a WAP-enabled web site:...