Bowie Bailey writes:
On 5/11/2016 7:45 PM, Sam Varshavchik wrote: > Bowie Bailey writes: > >> $ testmxlookup westportyachtsales.com >> Domain westportyachtsales.com: >> Relay: mail.westportshipyard.com, Priority: 10, Address: >> ::ffff:208.91.197.132 > > There's something wrong with the westportshipyard.com domain. ... > Looks to me like this domain's bill was due last month, and it was not > paid, and the registrar took ownership of it.Looks like you are right. The westportshipyard.com website returns a Network Solutions parking page. However, that doesn't explain why testmxlookup and manual dns queries return different results. I ran a tcpdump on the mail server this morning and found that testmxlookup is requesting an AAAA record for some reason. When it doesn't get a result, it gives a soft error rather than looking for the A record (which does exist). [udp sum ok] 9540+ AAAA? mail.westportshipyard.com. (43) [udp sum ok] 9540 ServFail q: AAAA? mail.westportshipyard.com. 0/0/0 (43)
Indeed. The parking NSes are broken, and throw up a SERVFAIL in response to a DNS query.
How do I prevent Courier from trying to use ipv6?
Only by recompiling Courier without any IPv6 support.IPv6 has been here for a while. It's not a new kid on the block. If a DNS server barfs in response to an AAAA query, it's the DNS server's problem.
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