Hello,
Have you ever seen this error in your qmail-send logs?
This can mean that someone you are trying to send e-mail to has violated the DNS protocol and is sending oversize DNS responses to your server.
There are three solutions that can help with this problem.
Have you ever seen this error in your qmail-send logs?
CNAME_lookup_failed_temporarily._(#4.4.3)
This can mean that someone you are trying to send e-mail to has violated the DNS protocol and is sending oversize DNS responses to your server.
There are three solutions that can help with this problem.
- Install a djbdns DNS Resolver on your qmail server.
- Install the Big DNS patch for qmail.
- Ask the entity responding with oversize DNS results to fix their DNS.