I now have Sendmail report the fail deliveries by bouncing back to a bounce mailbox. E.g. failure to reach joe@example.com would bounce back to bounce+joe=example.com@mysite.com.
I was wondering if is possible to configure Sendmail to report successful deliveries in a similar manner.
Can I make it bounce to a similar address and say that email WAS delivered to joe@example.com ? Or should I just rely on the maillog file to analyze successful deliveries?
I am not sure what is a good practice to keep an eye on successful deliveries.
Edit: I am sending many emails to around 200 000 registered and confirmed members on around 4 different sites, recently I seen some dedicated email delivery services like Mandrill or SendGrid, I see Mandrill has a list of all recent messages with status next to it (delivered or bounced), I was wondering how are they tracking the delivers.