I use both mailbox and gmail. For people that are considering switching, some websites don't accept the mailbox domain, so be ready for that. Otherwise the service works great.
In over 6 years of using Mailbox, I only remember one website that rejected the domain. It's a government website and they only started rejecting "invalid" (non-duopoly) domains sometime this year.
I do occasionally get emails that take longer to arrive into my inbox (between 5 minutes up to 1 hour), but the emails always arrive eventually. Or maybe I haven't noticed...
Do you remember which websites rejected your Mailbox address?
I've been on mailbox for 6 years and I think the only issue I've had with rejections has been the email confirmation from some Discourse-based forums. But after I contacted the hosts and was added manually, the forums' emails made it through with no issue
I've never encountered this issue so far, and I've already changed my email on almost all commercial services. But thanks for reporting! I'll use Gmail with forwarding if I encounter this issue
