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not receiving external mail from exchnage 2010

I have recently migrated from exchange 2003 to 2010. Both exchange servers have been working fine, internal and external mail.

We have our roter managed by external services. I have had to have the mail IP changed from the old mail server to the new one.

At the same time I also decomissioned the 2003 server in the correct way according to ms documentation.

After this I can not receive external mail to the 2010 server.

I can send out mail, I can send and receive internally mail OK but no external mail is getting in.

I have run some tests

canyouseeme.org shows port 25 is open and it appears it is pointing to the correct IP.
I have run the exchange 2010 SMTP check mail and this shows all green ticks.

Any suggestions how I can troubleshoot this further?
with thanks
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Jamesm007
Asked:
Jamesm007
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1 Solution
 
Jamesm007Author Commented:
Update on the issue.

If I send an email to myself internally from the organisation, I receive it to my external email no problems.

When I reply once tot his email, it does not come into exchange 2010 and I dont get any delivery failed.

However if I hit reply about 10 times to the same email, I will receive approx 3-5 delivery message failures - see below for message error.

It appears from this that the port redirections are OK but something not quite right with Exchange 2010 setup? although was working.

message details:

            The e-mail account does not exist at the organization this message was sent to.  Check the e-mail address, or contact the recipient directly to find out the correct address.
            < nskntmtas04p.mx.bigpond.com #5.1.1 smtp; 550 5.1.1 <user@domain.xx>: Recipient address rejected: undeliverable address: User unknown>


note I have masked the user@domain for privacy - it did show the correct email address which works internal to the organisation.
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Dustin99352Commented:
You need to configure your receive connector to allow anonymous in the permission groups.  

Load Exchange Management Console.
Go to hub transport under server configuration.
Select the DEFAULT <Servername> receive connector
Go to properties
Go to the far right tab labeled permission groups.
Check the box that says anonymous users.

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endital1097Commented:
use https://testexchangeconnectivity.com/Default.aspx to test internet email

@dustin99352 is correct on the receive connector
by default exchange 2010 does not enable a receive connector with anonymous access
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Jamesm007Author Commented:
Thanks Dustin this seems to have partially fixed the problem. If I send 4 test emails 2 of the come to the inbox and 2 are returned as undeliverable with same message as earlier.
Any ideas? Thanks
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endital1097Commented:
i would use https://testexchangeconnectivity.com/Default.aspx to test your environment

are all your tests sent from the same address?
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Dustin99352Commented:
The website posted above is very helpful.  Not to sound obvious, but are you sure you didn't mis-type the email address on some of your tests?  Generally if one message is getting through, all of them are.  

Thanks
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endital1097Commented:
i was thinking the same thing dustin, that they should all be delivered
the only other thing i can think of that may be a cause is reputation filtering
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Jamesm007Author Commented:
I am definately typing the correct address. I am replying 4 times to the same email and 50% of emails are not delivering.

I'll run that test and report back
Thanks
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Jamesm007Author Commented:
Connectivity test run and was successfully completed
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endital1097Commented:
do you have anything in front of exchange for antispam?
did you install the antispam agents?

there is a feature called sender reputation that may be causing your issue
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Jamesm007Author Commented:
I haven't installed any antispam agents at the server end but I do use dyndns for antispam but it would be safe to say as the message is comming from the server dyndns wouldn't be the problem?
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endital1097Commented:
i would investigate issues between the dyndns and your exchange server
check the logs there for directory lookup issues
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Jamesm007Author Commented:
This fixed the main problem. The secondary problem seems to only be existant for 1 mailbox as far as I can tell. all else seems ok so I will monitor and recreate the mailbox.
thanks for your help.
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