On 23 Oct 2019, at 14:33, Steve Matzura wrote:
[...]
On a whim, I change the DNS record for mail from A to CNAME.
That's a weird and dangerous whim. Hostnames that are used as the value
for MX records MUST have A records and hence MUST NOT have CNAME
records. The CNAME *MIGHT* work if done correctly for *SOME* sending
MTAs, but when it breaks (and it *WILL*) you will need to fix it.
Also, you did it wrong:
$ host theglobalvoice.info
theglobalvoice.info has address 95.142.174.193
theglobalvoice.info mail is handled by 10 mail.theglobalvoice.info.
$ host mail.theglobalvoice.info
Host mail.theglobalvoice.info not found: 3(NXDOMAIN)
$ host -t cname mail.theglobalvoice.info
mail.theglobalvoice.info is an alias for
theglobalvoice.info.theglobalvoice.info.
That indicates a common error made when specifying a hostname value of a
record in a BIND zone file.
HOWEVER: do not just fix the CNAME record, follow the RFCs and use an A
record.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
