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Users can not send email to comcast.net from outlook but can from OWA

supportfordeckertc
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Last Modified: 2012-06-27
A client of ours (15 users), everyone can send to comcast.net using OWA but cannot using outlook.  However they can receive comcast.net email in outlook.  We also have this client using google postini just recently, however its strange how this issue was nonexistant before.
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Commented:
Now that's odd. Are you getting a a bounce-back message (NDR) when sending from Outlook?  Those can usually tell a lot about the issue. If so, post it please.
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Top Expert 2012

Commented:
Are the OWA server and Exchange server running on different IP addresses? We have had this issues once when our Exchange server's IP address was on a blacklist.
Todd GerbertSenior Engineer
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Top Expert 2010

Commented:
Comcast is a pain in the neck, and I find they will block our IP address at the drop of a hat.

http://www.comcastsupport.com/Forms/NET/blockedprovider.asp

Author

Commented:
There are no bounce back messages in outlook and the server reports delivery confirmation.  And OWA and Exchange are one the same server, only 1 ip address.

We just tested sending to a comcast accnt from a blackberry, and it was received on the comcast accnt.

So sending/receiving to comcast.net accnt from blackberry and OWA both work, outlook can only receive it.
Todd GerbertSenior Engineer
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Top Expert 2010

Commented:
Do you have message tracking enabled, can you send a message from an Outlook client and check the logs to verify whether or not it was delivered to Comcast's mail servers?
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Top Expert 2012

Commented:
Again that your outgoing IP address is most liley blocked.
Todd GerbertSenior Engineer
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Commented:
...and unless I'm mistaken, PostIni should only affect inbound mail?

Author

Commented:
One of our techs just created an exchange accnt for himself at the client and logged on with it, on one of their computers and sent email from outlook ... the comcast accnt got it ...WEIRD

Now it seems creating new outlook user profiles is fixing it ...

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Commented:
yes tgerbert you are correct, was just thinking outside the box and hoping it was a coincidence that this problem started after putting them on positini
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Commented:
This one is on us!
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Commented:
tgerbert,

Have you ever contacted comcast about this? and if you did, what did they tell you?
Todd GerbertSenior Engineer
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Top Expert 2010

Commented:
I tried, but was never able reach anyone worth talking to (just the usual "Is it plugged in? Is your firewall turned off?" kind of suggestions).

I ended up advising the recipient to contact Comcast, since logs clearly showed the mail was leaving my system.

Author

Commented:
OK

Email SOMETIMES gets delivered now to the comcast accnt and sometimes it doesnt and sometimes it takes 2 hours and since our reports delivery confirmation to comcast, I dont see what else we can do here.  Thanks for your help guys.

Author

Commented:
Solution: Don't get a comcast.net email address. :)
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