This is precisely why we don't provide free account at FastMail any more - and even then the free trials are causing us trials and tribulations right now.
Honestly, good luck - but you're going to find that giving away something for free to other people is very different than running it for yourself right about the first time something goes wrong and a few thousand very angry people want to know what's up with their email.
(and as an aside, I really think good email service is worth paying for, and having been woken in the middle of the night to fix things that customers never even noticed - I know that it won't stay surprisingly pleasant forever)
Because of the domain registration costs, using emailing with Pawnmail is not free. This should dramatically reduce the incentive of using Pawnmail to spam.
Btw, @vortico I'm using Pawnmail for my new domain name and it looks quite nice so far, thanks!
Fastmail is the only good option outside of running your own email. Glad to be a customer as I'm currently fed up with fighting spam. Also, you can't beat the Fastmail web interface.
Honestly, good luck - but you're going to find that giving away something for free to other people is very different than running it for yourself right about the first time something goes wrong and a few thousand very angry people want to know what's up with their email.
(and as an aside, I really think good email service is worth paying for, and having been woken in the middle of the night to fix things that customers never even noticed - I know that it won't stay surprisingly pleasant forever)