Originally Posted by gaurvrishi
Can you please confirm me why i am getting this error only
"all relevant MX records point to non-existent hosts". what does it indicate and if this error come what is to be done
If you tried to look up that message, you'd find lots. Whatever MX records the DNS query returns aren't valid, so you've got DNS issues. Where are you getting your DNS information from? This is separate from where your own DNS information is hosted. And are you pointing to an internal or external DNS server? And if a domain fails, use NSLookup to see what MX records are returned. It could also be that you have some cached lookup information that isn't being updated, so flush your DNS cache too. Essentially, do basic diagnostics, and try to look up errors.
AGAIN: if you are able to send mail EVERYWHERE but one domain, then there may be a problem with that domain, NOT WITH YOUR EMAIL SYSTEM
. They could have you blacklisted as a spammer, wrong address, changed their domain name, or could just be having server problems. Have you tried to resend, as suggested? And as you were told before, exim is NOT RECOMMENDED for RHEL:
You seem to have ignored that advice, installed it anyway, and are now surprised you're having problems.