Re: Exchange 2007 - Couple of quick questions (FQDN and Queue Viewer)

  • Thread starter Andrew Hodgson
  • Start date Views 961
A

Andrew Hodgson

On Sat, 19 Dec 2009 17:11:39 -0800, "GG" <rng9598@gmail.com> wrote:

>"Andrew Hodgson" <andrew@hodgsonfamily.org> wrote in message
>news:pvcpi5dfqrjvp79ovvve2npq9ic42k7air@news.giganews.com...
>> On Thu, 17 Dec 2009 18:36:12 -0800, "GG" <rng9598@gmail.com> wrote:
>>
>>>Hey gents - There's a setting Org Configuration>Hub Transport>Send
>>>Connectors>Internet SMTP (name of our send connector>General Tab called
>>>"Specify the FQDN this connector will provide in response to HELO or
>>>EHLO".
>>>I've had Exchange up for a couple of years and have never populated the
>>>field. I did a Get-Exchange | fl command and determined what my fqdn was.
>>>Should this field be populated with the fqdn or can it remain blank as it
>>>has been?

>>
>> If the field is blank, it will send the ehlo string with the FQDN of
>> the server. So, if you have a HT server called server1, and your AD
>> domain was domain.local, then it would send out as the ehlo string
>> server1.domain.local if the field is blank.
>>
>> This field should match your external IP address PTR record for best
>> results, though it is rare that a mail server will reject mail on the
>> mismatch of the ehlo string verses the reverse lookup, it is more
>> likely to reject if your server is sending a .local domain suffix as
>> the ehlo string, because it can't be resolved on the public DNS.

>
>***The ehlo string it sends out is indeed <server>.<local domain>, e.g.,
>server1.domain.local. Do you think that could be a reason why my messages
>are being delayed in the situation outlined below?


It is certainly something which you need to fix. As I said, this name
should idealy match the reverse DNS (PTR) record for the external IP
address, and should have an A record pointing to it as well (i.e, is
easily resolvable in the DNS).

For example, on my system at home I send as the ehlo string
gollum.hodgsonfamily.org. If you look up the IP address for
gollum.hodgsonfamily.org, it resolves to 81.2.105.211. If you look up
the PTR record for 211.105.2.81.in-addr.arpa, you will get the result
gollum.hodgsonfamily.org.

As a quick fix you could set the ehlo domain to that of your email
domain, i.e, domain.com or mail.domain.com, so long as there is an A
record that points somewhere for the string, so it is resolvable in
the publid DNS.

If you want more help on this you are going to have to give us the
domain name in question, and the IP address that you send mail out
from.

Thanks.
Andrew.
 
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