On 2013-10-18 04:46, Doug wrote:
Hello,
$ idig plus.google.com mx
plus.google.com. 1200 IN CNAME plus-china.l.google.com.
plus-china.l.google.com. 600 IN MX 40
alt3.aspmx.l.google.com.
plus-china.l.google.com. 600 IN MX 50
alt4.aspmx.l.google.com.
plus-china.l.google.com. 600 IN MX 10 aspmx.l.google.com.
plus-china.l.google.com. 600 IN MX 20
alt1.aspmx.l.google.com.
plus-china.l.google.com. 600 IN MX 30
alt2.aspmx.l.google.com.
I never saw this type of MX. Are they valid records?
...
Doug,
This is fine. What would be bad is having a CNAME associated with the
other side:
mail.domain.ex. MX 10 bad.mailer.ex.
bad.mailer.ex. CNAME real.mailer.ex.
Cf. RFC 1912, 2.4 CNAME records.
Joe Yao
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