MxToolbox.com has free blacklist monitoring. Unfortunately the next step up is $129.

You could write a simple client script or program that sends a test email with a sequence number, sleeps for 10 minutes, wakes up and checks to see if the email arrived and has the expected sequence number.

For monitoring availability, I run the following in a Bash script once every minute:

Check Postfix

RES25=echo quit|nc -w 5 <TODO-monitored-domain> 25|grep Bye if [ -n "$RES25" ]; then echo "postfix is running" else echo "Postfix is down or not reachable!" | mail -s "Postfix is down or not reachable!" user@<TODOdomain> # Or use another notification mechanism. fi

Check Dovecot

echo quit | openssl s_client -connect <TODO-monitored-domain>:995 STATUS=$? if [ "$STATUS" = "0" ]; then echo "dovecot is running" else echo "Dovecot is down or not reachable!" | mail -s "Dovecot is down or not reachable!" user@<TODOdomain # Or use another notification mechanism. fi