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I'm currently having an issue with exim4. Some mail isn't delivered. I found this in my rejected log.

2012-06-21 10:11:47 H=bart (bart.*.com) [] F=<info@****.com> rejected RCPT <>: all relevant MX records point to non-existent hosts

Is this an issue with my server or rather with the recepients server?

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up vote 3 down vote accepted

The DNS server of the recipient domain isn't configured properly. You can find more information about the problem on the Exim wiki.

Edit: Now when I have the recipient domain, here's some updated information. The MX servers for the domain are:

$ dig +short mx

The problem is that they don't have proper A records:

$ dig | grep NXDOMAIN
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 60414

Above I pasted only the MX with lowest priority for brevity, but all of them doesn't have A records.

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When I fetch the dns records for the host I get valid hostnames.; <<>> DiG 9.7.3 <<>> mx ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52851 ;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ; IN MX ;; ANSWER SECTION: 600 IN MX 8 600 IN MX 10 600 IN MX 7 600 IN MX 9 – W. Loockx Jun 21 '12 at 8:56
You get valid hostnames for the MX records, but neither of them resolves properly - they don't have A records in the DNS. – Vladimir Blaskov Jun 21 '12 at 8:58
I edited my answer above with some more information added. – Vladimir Blaskov Jun 21 '12 at 9:02

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