I can't see a better example of Google dropping the ball than you paying for some other service so that you can then consume it from gmail. :) 500 is a reasona

I can't see a better example of Google dropping the ball than you paying for some other service so that you can then consume it from gmail. :) 500 is a reasonable limit I think, in case spamming would be some reason for them not to do this. I don't have an opinion about whether people should be able to send from marker@gmail.com or if it should just end up in a real inbox but without the ability to send from that address.