I run mailsac.com and skim a profit. I failed to properly sell to a couple of customers that would have made it fairly profitable (at least two very large compa

I run mailsac.com and skim a profit. I failed to properly sell to a couple of customers that would have made it fairly profitable (at least two very large companies use it for email testing). It has a decent number of users and signups but I haven't spent the time to figure out if there is more they'd pay a lot for. It took about two years of literally doing nothing to make a profit.