We have a 3rd party monitoring services setup to query for pop3 and smtp ports 110 and 25 and seeing a random timeouts for both services such as below

 > On May 19, 2015, at 7:42 AM, RTXperts -ActiveXperts <RTXperts@realtytrac.com> wrote:

>

> Event: Failure on 10.11.1.2 at 07:42:23 AM.

>

> Item:

>    rtex01- SMTP Mailserver

> Explanation:

>    Failed to connect to host [10.11.1.2:25]

>

> Error from RTXPERTS [05/19/2015 @ 07:42:23 AM]

>

Hi,

Please make sure the related Exchange services are started and running in your Exchange server. Then check the POP settings:

Get-PopSettings | FL

Confirm whether the client users can send and receive messages or not. Also collect any error logs from Exchange server instead of third-party program for further analysis.

Regards,