mouss at netoyen.net
Wed Sep 24 20:03:28 UTC 2008
Andrew Norris wrote:
> Back to the PTR RR:
> $ dig +short MX bobhoffman.com
> 10 mail.bobhoffman.com.
> $ dig +short A mail.bobhoffman.com
> $ dig +short -x 126.96.36.199
> mail.bobhoffman.com != bobhoffman.com
mail.bobhoffman.com is the MX. bobhoffman.com is an RMX.
$ host -t mx yahoo.com
yahoo.com mail is handled by 1 e.mx.mail.yahoo.com.
yahoo.com mail is handled by 1 f.mx.mail.yahoo.com.
yahoo.com mail is handled by 1 g.mx.mail.yahoo.com.
yahoo.com mail is handled by 1 a.mx.mail.yahoo.com.
yahoo.com mail is handled by 1 b.mx.mail.yahoo.com.
yahoo.com mail is handled by 1 c.mx.mail.yahoo.com.
yahoo.com mail is handled by 1 d.mx.mail.yahoo.com.
no one of these is web23004.mail.ird.yahoo.com, ...
> This may not be your main problem, but it certainly isn't helping
If we ignore the surrounding IPs (too many without rDNS), he has a very
simple setup, that should not cause any problems.
> Yahoo seems to be pretty picky on reverse DNS. I had a VPS
> running a mail server where the PTR matched the host. I was relegated
> to yahoo's spam folder until changed from the default PTR which looked
> mildly like a dialup.
generic PTRs are a different matter.
More information about the CentOS