I've acquired a new piece of server monitoring software (I refuse to pay $40/month PER URL to some monitoring service), and I'm trying to figure out how to monitor DH's mail servers.
With the problem that we just had today on Hoggle, normal monitoring didn't show a glitch, apparently since the server is up-- just not coughing up the mail.
So, when I just monitor port 110 (POP3), the server looks responsive, even though it's not.
And monitoring port 220 (IMAP) doesn't work at all with DH; the software sez the servers are always down. I take it this means DH is somehow using port 110 for both POP3 and IMAP...? Or you're using another port for IMAP...?
It appears the only way to truly know if the servers are working is to check them and test for a certain string in response. The software ("Server Sentinel", Mac) allows me to enter a server name, a port number, and some optional string to test for. So, the question is, what string do I want to test POP3 for?
And do I need to test separately for POP3 and IMAP? If so, are there different strings to test for?