Mail server cannot send email to a specific domain
Jeffrey Meltzer
jeffrey at meltzer.org
Wed Sep 24 17:09:19 UTC 2003
When dealing with mail, the fwd/rev should always match.
Ie,
yourdomain.com. IN MX 10 mail.yourupstream.com.
mail.yourupstream.com. IN A 10.11.12.13
13.12.11.10.in-addr.arpa. IN PTR mail.yourupstream.com.
Is the normal, proper way to set things up. Having the mx pointing to
mail.yourdomain.com where mail.yourdomain.com is a cname to
mail.yourupstream.com is a nice way to pretend you have your own mailserver,
but it's broken.
Also, lots of spam checker's check to make sure fwd/rev dns matches.
jeff
> -----Original Message-----
> From: bind-users-bounce at isc.org
> [mailto:bind-users-bounce at isc.org] On Behalf Of JRR
> Sent: Wednesday, September 24, 2003 11:17 AM
> To: comp-protocols-dns-bind at isc.org
> Subject: Mail server cannot send email to a specific domain
>
> This may not be the place for this and I'm not a DNS pro (although I
> understand the concept and can setup simple DNS entries), but
> I'm not sure
> if this is DNS related or not, so here goes...
>
> I have a Windows based mail server that has a really tough
> time forwarding
> emails to a particular domain that is hosted by a hosting
> company. The
> receiving domain hosting company assures me there are no
> problems on their
> end, but I'm not so sure. I am also unable to forward emails
> to the hosting
> company themselves. My mail server SMTP log shows timeouts
> connecting to
> the receiving mail server. Every now and then a message will
> get through.
> Connectivity is not an issue.
>
> I started checking things out and initially found the
> receiving domain MX
> was referencing a CNAME entry. They fixed this, but still no
> go. Then,
> there was no reverse DNS entry for the receiving MX. They
> fixed this too,
> but I have a question about this one.
>
> I'm told by the mail server manufacturer that the reverse DNS
> entry for the
> receiving domain MX should reference the mail server itself
> or the exact
> problems I'm seeing can happen. This is an example of how
> the reverse DNS
> entries are setup for the subject domain:
>
> Mail server manufacturer says it SHOULD look like this (which
> is the way I
> usually see them):
>
> x.x.x.x.in-addr.arpa mail.receivingdomain.com.
>
> In the case of the subject domain, the reverse DNS entry
> looks like this:
>
> x.x.x.x.in-addr.arpa hostingcompanydomain.com.
>
>
>
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