Re: General DNS config questions
- From: Max C <maxc246@xxxxxxxxx>
- Date: 29 May 2007 14:24:33 -0700
Thanks for the reply, Michael.
The second DNS configuration you posted looks good to me. You would need to
change your SPF record to not include "a" however.
I must admit that SPF records are quite a mystery to me. I believe I
created that SPF Record with some sort of Wizard. Perhaps I need to
rerun the wizard.
When I set up DNS the way you said looked good, I could no longer
receive emails. Would that be because of the SPF Record including "a"
as you mentioned? Do I *really* need the SPF Record? Could I just
get rid of it all together?
My guess was that the reason I couldn't receive emails when set up as
per my second post was that the "@" host record was pointing to our
Web Server in an A Record. Of course, there was another "@" Record as
an MX record, which I thought would be OK, but my thought was that
maybe the A Record was overriding the MX record.
I don't think your delayed mail issue is DNS related though. Do you have
this problem with any domains OTHER than Hotmail?
Hotmail seems to be the worst, but other domains are having problems
as well. For some reason GMail almost never has the problem. As you
can guess, trying to get someone at Hotmail to work with me on the
issue is about as easy as running a marathon on the bottom of the
ocean. Yahoo Mail delays about 3 to 5 % of the time, cox.net about
20%. It's really hard to tell which domains have the problem the
worst because most of my users don't realize they've received a
delayed email.
Thanks again,
Max.
On May 29, 3:17 pm, "Michael Dragone" <no.e-mail=less_spam> wrote:
The second DNS configuration you posted looks good to me. You would need to
change your SPF record to not include "a" however.
I don't think your delayed mail issue is DNS related though. Do you have
this problem with any domains OTHER than Hotmail?
"Max C" <maxc...@xxxxxxxxx> wrote in message
news:1180455897.711483.189510@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On May 29, 10:20 am, Max C <maxc...@xxxxxxxxx> wrote:
OK, here's the deal. For the past several months our company has been
receiving a LOT of delayed emails. Some by a few hours some by a few
days. As you can guess, this is a serious problem. I've tried
several things to resolve this situation:
1 - call our ISP, who was taking care of DNS for us at the time. They
said they'd heard of others having the same issue, but that the DNS
records for our domains were configured properly.
2 - take control of our DNS records by moving them to GoDaddy and
setting the records up myself.
3 - put a sniffer between our ISP's router and our firewall to confirm
that delayed emails are *really* not making it to our network. (Turns
out, about 20 to 30% of hotmail emails always get delayed coming to
any of our domains, so sending a batch of 10 or 20 emails from hotmail
to one of our domains allowed me to see the raw data coming in through
the sniffer. There is no doubt that the emails that were delayed
coming in to a user's inbox did *not* make it to our network. Also,
interestingly enough, nearly 100% of emails from gmail make it through
without delay. I've tried this hotmail and gmail test with groups of
10 to 20 single emails dozens of times. Gmail is always on time and
hotmail always has 20 to 30% delays.)
4 - purchase a separate DSL line, ran it through our firewall and
pointed one of our domain names' MX record to the DSL line's IP info.
Hotmail emails to that domain name on the new DSL line were still
delayed.
So, as a last ditch effort, I thought it wouldn't hurt to post our DNS
record info to get some advice. I'm the first to admit that DNS is
not one of my strong points. Any advice on changes would be
appreciated.
_____________________________________________________________________________________
A records
Host Points To
@ WWW.XXX.YYY.37
mail WWW.XXX.YYY.37
exchange WWW.XXX.YYY.37
www WWW.XXX.YYY.36
ts2 WWW.XXX.YYY.42
CNAMES (Aliases)
Host Points To
smtp @
ts ts2
ftp @
MX (Mail Exchange)
Priority Host Goes To
0 @ mail
TXT (Text)
Host TXT Value
@ v=spf1 a mx ptr ~all
_____________________________________________________________________________________
I read earlier today that @ should point to my web server (WWW.XXX.YYY.
36) instead of my exchange server (WWW.XXX.YYY.37) and that www should
be a cname pointing to @. Could that be causing emails delays? I
tried making that change on one of our unused domain names, but then I
didn't receive emails at all.
Thanks for any insight at all.
Max.
To add to my above config, I use godaddy.com for DNS config. Here's
something I've been playing around with:
I changed the following records as such:
A Records
Host Points To
@ WWW.XXX.YYY.36 (web server)
mail WWW.XXX.YYY.37 (exchange server)
exchange WWW.XXX.YYY.37 (exchange server)
CNAMES (Aliases)
Host Points To
www @
MX (Mail Exchange)
Priority Host Goes To
0 @ mail (A Record for exchange server)
________________________________________________________________________
GoDaddy.com says that "@" simply refers to the domain name in
question. So, I thought "maybe it would be OK to have the A record
for @ pointing to the web server (WWW.XXX.YYY.36) and then a MX record
for "@" pointing to the exchange server (WWW.XXX.YYY.37)
It would appear that line of thinking was incorrect. When I set up my
test domain as above, I could not receive emails to that test domain.
Thanks for reading again.
Max.
.
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