Hi, I am using postfix on an embedded device. Incoming email access is limited to a very short whitelist, and there is a very short list of potential recipients. The system is very secure and quite efficient: that's why I picked postfix.
What I'd like to do is check on a postfix start or reload that these few addresses are reachable *before* I do things like set up firewalls, etc., then stop sending out probes at all. Basically, I want to ping the email address and notify admins (via some channel) that an email address reachable or not. I've read theADDRESS_VERIFICATION_README and can't quite figure out what is even relevant to my problem, and know that that may not even be the best route for "pinging". What would be the most common way to do this? It's perfectly possible I'm missing something painfully obvious here. Note: a relay_host is usually involved. Thanks, Dave
