Exchange 2013 - Mail appears to be working but I keep getting an SMTP availability is low error

I recently set up an Exchange 2013 server, as part of a migration from 2007. It appears that mail is flowing well internally and externally. However, I'm consistently getting the following error in the logs (error 1040)- "The SMTP availability of the Receive connector Default Mailbox Delivery was low (0 percent) in the last 15 minutes."

Any idea what could be the cause of this error? Is it possible that this relates to a connector that just isn't used?
ruhkusAsked:
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singo30Commented:
Seems it would be new setup.  did you configured you MX record and Host A Record properly in External Public DNS.  Port number 25 should be open in our External Firewall.

If the probelm with Host A and MX records , you can send one test mail after that you could nt .
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ruhkusAuthor Commented:
We're sending and receiving mail fine and have been for about 2 weeks now, so I believe external DNS is set up correctly - unless you have reason to believe it may not be set up right despite it working fine?
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Md. MojahidCommented:
Changing the time out settings for the OWA ports (http, port 80 and https, port 443 ) rules on your firewall might help.

Hope also these articles will help you.
Please ignore the above article. And see the below Article it will definitely help you.

http://msexchangeteam.com/archive/2006/04/03/424028.aspx

and if you have ISA Server in your organisation then see the below article.

http://blog.danielcosta.pt/?p=113

https://social.technet.microsoft.com/Forums/en-US/f815188f-4c5a-4768-bf1c-0f72a855e026/exchange-activesync-errors-event-id-1040-the-average-of-the-most-recent-heartbeat-interval-535?forum=saas
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Sandal TolkCommented:
I dont think your answer has anything to do with the original question.
Why do you link active sync articles on a question regarding smtp connectors?
The error number may be the same, bur the source is different.
I just wonder, why is this the accepted solution?
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