Re: General DNS config questions

Hi Max. See below.

"Max C" <maxc246@xxxxxxxxx> wrote in message news:1180537012.469501.35990@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

[snip]

A remote system attempting to send you mail will query DNS for all your MX
record values and attempt delivery to the one with the highest priority (the
*lowest* numerical value) first. A second DNS query will be made for A
record of the hostname returned by the MX lookup (in your case your MX
record indicates mail.domain.com) to obtain its IP address. Delivery will
then be attempted to that IP address over port 25 (SMTP).

In addition to the A and MX records, I also created a couple of SRV
records for my test domain for SMTP and HTTP. Those would seem to be
more of a "Just in case" thing to me, but I figured they probably
wouldn't hurt. What's your opinion?

I don't know of any application aside from Active Directory that looks for SRV records.

Once you've got your DNS squared away (and like I said earlier I don't
believe this is your issue - you can receive mail, albeit mail from some
domains is delayed), and since it looks like you're using Exchange, you
might want to repost this to one of the Exchange newsgroups so we can get
some more Exchange expertise on this issue.

Well, that might be a good next move, but I'm 100% confident that this
is not an Exchange issue. I put a sniffer on our inbound wire between
the ISP's router (which does no firewalling) and our firewall. Then I
sent 10 emails from hotmail to my email address here. I could see
from the sniffer logs that the 3 emails that didn't arrive instantly
in my inbox also did not come in to our network. They just got lost
on the internet, from what I can tell.

If this were just Hotmail, I'd say "The heck with it" but it's
happening to about a dozen (or more) other domains trying to send us
email. I honestly don't see how this could possibly be our fault, but
it's also not the fault of our ISP, since I had the same problem when
I set up another ISP for testing. I'd like to blame it on the
internet in general, but no one else seems to be complaining.

The e-mail that didn't arrive instantly did arrive eventually though, correct? Did you happen to take a look at the mail headers for an "instant" message vs. a delayed one?

Thanks again for your time. It's greatly appreciated.

You bet.

.

Relevant Pages

  • Re: Blacklists and relays
    ... We have exchange 2003. ... Our ISP is blocking many emails. ... 4)How does setting up relay with the ISP, and setting up a smarthost on ...
    (microsoft.public.exchange.admin)
  • Re: multiple Domain name delivery problem
    ... Susan Conkey [MVP] ... with the known emails that were already there. ... this is the craziest problem i have seen w/ exchange & we have been ... was...does she have her "delivery point" set to the mailbox? ...
    (microsoft.public.exchange.admin)
  • RE: ETRN
    ... there are two ways to deliver email from Exchange. ... You will deliver emails to the destination server, ... I'm not sure your ISP supports this function. ... Microsoft is providing this information as a convenience to you. ...
    (microsoft.public.exchange2000.admin)
  • RE: Client transition from POP to Exch email
    ... Would this take them off the Exchange server... ... emails via POP3 from the ISP when they are traveling. ... delivery to the Exchange server - what do you recommend for users to continue ... and all emails are delivered to Personal Folders (.PST ...
    (microsoft.public.windows.server.sbs)
  • Re: Slightly O.T. - one user can send but cant receive
    ... You really don't want to mix account types in Outlook (it almost invariably ... Just got a message from the ISP. ... Hmmm - but how is he connecting to Exchange? ... say he is not getting any emails. ...
    (microsoft.public.exchange.admin)