Forum Discussion

naturalpestcont's avatar
New Contributor
5 years ago

Error code CXSNDR.

I use outlook and recently random emails to people I frequently email come back with error code CXSNDR. Anyone know how to make this stop or why it just started happening?

1 Reply

  • Hello. That error code related to the DNS of the email sender. Basically, there was an issue with the connecting Ip address DNS causing the reverse DNS lookup for your ip address to fail. You can find more information about our email error codes here: -Allan, Cox Support Forums Moderator.