I am using startmail at the moment with a custom domainand am pleased but I do plan on migrating due to the cost for adding more mailboxes. So I am reading along here but from my research recently I personally also found Tuta attractive along with mailbox for their price and feature set. What has proton done by the way? I have never really trusted the organization but has something happened recently?
Instead of using a sort of Docker Hub proxy, you can also use GitHub’s repository or Quay. If the project allows it, you can easily switch to these alternatives. Alternatively, you can build the Docker image yourself from the source. It’s usually not a difficult process, as most of it is automated. Or what I personally would probably do is just update the image a day later if I hit the limit.