Bounced Email

[199002003]

I have just switch to different ISP and already changed the MX Record; everything seems working fine; one of our customer said that they can send the email to me, they got this error error message:

Your message did not reach some or all of the intended recipients.

Subject: notebook 7/21/06
Sent: 7/24/2006 8:28 AM

The following recipient(s) could not be reached:

john luis (E-mail) on 7/26/2006 8:41 AM
Could not deliver the message in the time limit specified.
Please retry or contact your administrator.
<Exchange5.MAIL #4.4.7>

Kevin S (E-mail) on 7/26/2006 8:41 AM
Could not deliver the message in the time limit specified.
Please retry or contact your administrator.
<Exchange5.MAIL #4.4.7>
I haven't changed any policy on my end; can anyone tell me why can't I get the email from this sender?

Many thanks,
-Steve

 

[199002003]

sorry, I mean they can't send the email to me.

Many thanks,
-Steve

 

[lebisol]

how long ago was the MX changed?
DNS take time to propagate...it could be that their DNS server has not received the update.
Have your sender try to setup SMTP connector based on IP to bypass DNS and see if they can send it to you.
Have your sender do a nslookup from their DNS server (or their ISP's server)....
visit

http://www.dnsstuff.com/

and do some tests yourself to see if the MX is its place...
All the best!

:--------------------------------------:

[URL unfurl="true"]http://mostarnet.com[/url]

All around in my home town,
They tryin' to track me down...

 

[199002003]

It was a week ago; I am pretty sure is it up to date now.

do you think this article apply to me?

http://support.microsoft.com/?kbid=895857

Thanks,
-Steve

 

[lebisol]

Is this error for every user or only the 2 listed.
If so then we need to look towards your exchange if it applies to everyone in your org then there 2 concepts to conisder:
1. DNS related communication (as noted above)
2. Your Roter/Firewall/Port 25 being blocked

post your IP or domain if you would like some one here to run a few tests....if you can for sec. reasons.

Again, if this error is from only one domain (sender) then they might have trouble commicating with your server for their own bag of issues.

All the best!

:--------------------------------------:

[URL unfurl="true"]http://mostarnet.com[/url]

All around in my home town,
They tryin' to track me down...

 

[58sniper]

It's very likely that they cached the old MX record with a really long ttl, so their system doesn't know it's changed. As a result, their system is still attempting to send to the IP address in your old MX record.

MX records don't propagate with DNS records (like nameservers). But they do get cached based on the ttl specified with the record.

Pat Richard, MCSE MCSA:Messaging CNA
Want to know how email works? Read for yourself -

http://www.ietf.org/rfc/rfc2821.txt

 

[lebisol]

oh nice one 58sniper...as suggested you can try to have them delete the cache on their DNS server

:--------------------------------------:

[URL unfurl="true"]http://mostarnet.com[/url]

All around in my home town,
They tryin' to track me down...

 

[199002003]

they basically can't send any mail to anyone on my domain, everyone else can send email to my domain fine and just this one only.


Thanks a bunch for the help; I just verified with the sender and they sent their DNS mx record to me and it show the correct mail server and the IP address; I had to open an authentication port on my firewall just for this client only to have the traffic coming through, and the email seems coming through now. I am not quiet sure why.

Many thanks,
-Steve

 

[58sniper]

AUTHENTICATION PORT?

Pat Richard, MCSE MCSA:Messaging CNA
Want to know how email works? Read for yourself -

http://www.ietf.org/rfc/rfc2821.txt

 

[199002003]

To clarify, I disabled the port again and the email was coming
though, so it wasn't the authentication port at all; they didn't admit that they have to clear the DNS cache, but after talking to them a few time and the email is working "magically"

Thank for you help,
-Steve

 

[rmcdaniel]

So are you under the assumption that they just cleared the dns cache?

 

[199002003]

is it possible that they block the access to send email to my domain (blacklist)?

 

[ReadRight]

Or the TTL expired, that would be pretty magical 8)