Does anyone have any good ideas how to monitor your MN? enabling sendmail in the VPS and opening ports is one option, but probably not a very good one.
Ping works, but thats no guarantee darkcoind is actually running..
Simple. Bookmark this page
http://drk.poolhash.orgYou have two independent Masternode listings. Check your IP against them. If all is good, they'll show up nicely.
But that requires manual inspection

I will look into the possibility of using postfix and sending email if darkcoind goes down..
Ah, I get what you mean. But checking emails also requires manual check. Obviously you can get an email notification pushed onto your phone I guess...
Use
http://uptimerobot.com/--> HTTP and Keyword monitors :
Use address as Keyword.
If NM is invalided in both poolhash and darkcoin.io, entry will be removed.
http://drk.poolhash.org/vertcoin/blocks/masterlist.json is source for listing.
uptimerobot Alert : Get alerted via e-mail, SMS, Twitter, web-hooks or push.
(Twitter alarm is very good)
This sounds like an excellent solution for me, since i use my email inbox for basically everything. Will grab some coffee and try to get it working, thanks!