I've been running my email on Helm for the past month with no dropouts of service - it's worked with no issues this whole time, and we use Comcast in SF, so it's not the best upstream there is.
Mind sharing your domain? I'd love to peek at what they do DNS-wise. lvh at latacora dot com if you don't just want to hand it to all of HN :) The e-mail in your profile is hosted by Google, which makes sense because it looks like work email.
I'm easy to find on the internet. me@garrytan.com
Neat! Who's Privacy Labs, Inc?
Oh that's the actual legal name of the company that created Helm.