SMTP Problem - Exchange + Outlook
We have not had any issues with our exchange server in the past but the users are now trying to contact a new email client and are receiving an error message - see below:
"There was a SMTP communications problem with the recipient's email server. Please contact your system administrator. <exchange server name.domain #5.5.0smtp;554. This server requires PTR for unauthenticated connections.>"
I have contacted our ISP and they have added an "A" record in our DNS list pointing to the name of the exchange server.domain and the routable IP address assigned to the exchange server. We still get the same error message. What would I require to do to be able to send email?
"There was a SMTP communications problem with the recipient's email server. Please contact your system administrator. <exchange server name.domain #5.5.0smtp;554. This server requires PTR for unauthenticated connections.>"
I have contacted our ISP and they have added an "A" record in our DNS list pointing to the name of the exchange server.domain and the routable IP address assigned to the exchange server. We still get the same error message. What would I require to do to be able to send email?
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SOLUTION
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ASKER
We have added the PTR record for mail.example.com (used our credentials) and all the tests are successful indicating that the reverse DNS is working properly. However, the same error message still shows up when emailing that one client. Since the error message points to the name of the exchange server (exc-01.domain name) directly, should we also add a PTR record pointing to the name?
No the PTR should ideally be the MX entry ... and i guess your Firewall\Gateway server is the incoming and outgoing server .....
- Rancy
- Rancy
If you run the following from a command prompt - do you see mail.example.com as the result:
nslookup your_external_ip_address (e.g., nslookup 123.123.123.123)
nslookup your_external_ip_address (e.g., nslookup 123.123.123.123)
ASKER
If the solution to the question is found by the asker - how would one close the question without points being awarded? I have found the answer to questions before and noted the results in my comments but the question remained open. The only way to close the question seems to be picking one responder and awarding him the points.
ASKER
OK - thanks
Please award the points as you see fit.
Please award the points as you see fit.
Also check
www.mxtoolbox.com
Check inbound and outbound email
www.exrca.com
- Rancy