That policy of theirs has existed for a long time now. It's a really odd one at that.
They also don't enforce DMARC, nor do DKIM. It's stuck nearly four decades in the past.
They also don't enforce DMARC, nor do DKIM. It's stuck nearly four decades in the past.
Maybe "strictly worse than 40 years ago"?
I did end up later moving to Proton primarily out of laziness. I thought these issues would be a thing of the past until I applied to work at a company that administered their own Exchange server that also black holed my messages from Proton's servers. Their reasoning? "We geo-block Switzerland for security reasons." Needless to say I turned them down.
Every month or so I had this issue and I had to contact them through a form somewhere and I would get emails back from someone in india who reset my 'reputation'. They have some stupid made-up reputation system which means they need to see significant volume from you that is not marked as spam for them to accept your mailserver.
And yeah proton has similar issues. A lot of companies blackhole even confirmation emails there. So you can't confirm accounts with a proton email and they give zero indication as to why. Tinder and the internet archive (archive.org) come to mind.