Delivery Status Notification (Delay) - Outlook Calendar meeting requests

When sending Outlook Calendar meeting requests to certain people I get the following message:
This is an automatically generated Delivery Status Notification.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipients has been delayed.
        emailaddress@pop3domain.com
        emailaddress@pop3domain.com
        emailaddress@pop3domain.com

The user sending the meeting requests is on a hosted Exchange server. The recipients are on a POP3 server. Test emails to those same email addresses send fine. It appears to only be Outlook meeting requests.

I tried the steps posted on a previous question but I get an error "DNS request timed out." and the IP shown is a OpenDNS server. Below are the results of those steps from NashvilleGuitarPicker
 http://www.experts-exchange.com/Networking/Email_Groupware/Exchange_Server/Q_20993899.html

> set type=mx
> mail.pop3domain.com
Server:  WL.domain.com
Address:  192.168.2.1

Non-authoritative answer:
mail.pop3domain.com   canonical name = pop3domain.com
pop3domain.com        MX preference = 50, mail exchanger = pop3domain.com
pop3domain.com        MX preference = 10, mail exchanger = pop3domain.com.s7
a1.psmtp.com
pop3domain.com        MX preference = 20, mail exchanger = pop3domain.com.s7
a2.psmtp.com
pop3domain.com        MX preference = 30, mail exchanger = pop3domain.com.s7
b1.psmtp.com
pop3domain.com        MX preference = 40, mail exchanger = pop3domain.com.s7
b2.psmtp.com
> ping mail.pop3domain.com
Server:  mail.pop3domain.com.Belkin
Address:  67.215.65.132

DNS request timed out.
    timeout was 2 seconds.
*** Request to mail.pop3domain.com timed-out
>>

>C:\ping mail.pop3domain.com

Pinging pop3domain.com ["POP3 IP"] with 32 bytes of data:
Reply from "POP3 IP": bytes=32 time=32ms TTL=55
Reply from "POP3 IP": bytes=32 time=35ms TTL=55
Reply from "POP3 IP": bytes=32 time=32ms TTL=55
Reply from "POP3 IP": bytes=32 time=35ms TTL=55

Ping statistics for "POP3 IP":
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 32ms, Maximum = 35ms, Average = 33ms

>>

>C:\telnet mail.pop3domain.com 25
Connecting To mail.pop3domain.com...Could not open connection to the host, on
port 25: Connect failed


smihelpAsked:
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
This is a known issue.   I have run into this a dozen or so times.     Follow this article:

http://support.microsoft.com/kb/938650
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Well I believe you are running into the known issue.
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smihelpAuthor Commented:
Thanks for the quick response! I'll check with my Hosted Exchange provider and let you know what they say.
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
My guess is they should have this set.    This usually occurs when you have modified a calendar and it attempts to update the attendees.     So my guess now this is not the case.
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smihelpAuthor Commented:
I just tested it and that is the case. The "Delivery Status Notification (Delay)" error only occurs when you change the meeting and it attempts to update the attendees. I 'm still waiting to hear back from our Hosted Exchange provider.
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Yes this is the exact issue...when a calendar appt is set works...but then when you change and update the appt it does not send and is caught in the queue.      
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smihelpAuthor Commented:
Support said that a hotfix needed to be applied to the Exchange server. Thanks for your help!
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amybCommented:
Are there any other work arounds if the hotfix to the server does not fix the issue. I have updated the users office with the latest service pack. The user continues to have the same issue.
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