Simon Loewen writes:
DNS on the server works well as verified with dig and getent, yet testmxlookup fails with Soft Error. My original question remains unanswered: How does courier consult DNS?
By sending a query to the DNS server(s) specified in /etc/resolv.conf, and waiting for a reply.
# dig mx dnstext.com ; <<>> DiG 9.4.2-P2 <<>> mx dnstext.com ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 36511 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;dnstext.com. IN MX
I get different results: [mr...@commodore tmp]$ dig mx dnstest.com ; <<>> DiG 9.5.1-P2-RedHat-9.5.1-2.P2.fc10 <<>> mx dnstest.com ;; global options: printcmd ;; Got answer: ;; →>HEADER<← opcode: QUERY, status: NOERROR, id: 38177 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 0 ;; QUESTION SECTION: ;dnstest.com. IN MX ;; ANSWER SECTION: dnstest.com. 86381 IN MX 10 mail.dnstest.com. ;; AUTHORITY SECTION: dnstest.com. 86369 IN NS ns1.ifox.com. dnstest.com. 86369 IN NS ns2.ifox.com. [mr...@commodore tmp]$ dig mail.dnstest.com a ; <<>> DiG 9.5.1-P2-RedHat-9.5.1-2.P2.fc10 <<>> mail.dnstest.com a ;; global options: printcmd ;; Got answer: ;; →>HEADER<← opcode: QUERY, status: NOERROR, id: 13504 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 0 ;; QUESTION SECTION: ;mail.dnstest.com. IN A ;; ANSWER SECTION: mail.dnstest.com. 86400 IN CNAME sam.ifox.com. sam.ifox.com. 86400 IN A 208.67.8.8 ;; AUTHORITY SECTION: ifox.com. 86400 IN NS ns2.ifox.com. ifox.com. 86400 IN NS ns1.ifox.com. For me, testmxlookup works just fine: [mr...@commodore tmp]$ testmxlookup dnstest.com Domain dnstest.com: Relay: sam.ifox.com, Priority: 10, Address: ::ffff:208.67.8.8
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