Dear Charlie,
with the standard SMTP&POP3 Round Trip sensor, you can define SMTP and POP3 servers independently from each other.
In your description, only at step a) and d) PRTG is involved. In step a), PRTG can send an email to your internal SMTP server. Of course, PRTG will need to check the external mailbox at step d), which should not be a problem, as it is located on the Internet, right?
So, in the PRTG web interface,
- Create a new device with the DNS or IP address of your internal SMTP server.
- On this device, create a new SMTP&POP3 Round Trip sensor - the "Add Sensor" screen will appear.
- Under section "Step 1...", enter necessary credentials for your internal SMTP server.
- Under section "Step 2...", enter DNS or IP address of the external POP3 server on the Internet and enter necessary credentials.
Alternative option for installations with no direct Internet access
If you cannot access the Internet from your PRTG installation (e.g. due to company policy), please consider altering step d) and adding an additional step e), as the following:
- d) Have the external POP3 mailbox forward the email to another internal POP3 account immediately (but make sure that the email's subject is not changed by the forwarder!)
- e) Use PRTG to check for the arrival of that forwarded message in your internal POP3 mailbox and alert if it either doesn't arrive within a specified time, or takes too long to arrive.
When using this alternative option, you'll have to enter the internal (not external) POP3 server's details in "Step 2..." (see above).
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