Went to the replies to say this. You got here before me

12 days and 17 hours. As another commenter pointed out, checked with uptime

Fair mistake to make, they have a very similar colour scheme I can see. Happy to hear of yet another mail provider to consider, I want to hear about as many as possible; I want to make the right choice

As far as I can tell from posteo’s own FAQ site, they do not allow custom domains. I’d really consider swithcing to them otherwise. Do you use posteo?