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If Gmail is rejecting your custom domain, you haven’t setup your SPF, or DKIM records etc for you custom domain that authorizes proton to be a valid email sender.

E.g when Gmai receives an email from a custom domain it will look up records to confirm the mail server sending it is valid.

Checkout https://proton.me/support/anti-spoofing-custom-domain or search proton SPF DKIM for guides.

You wouldnt have issues sending from a proton domain as they already have these in place for you.

A few more apps than I was aware of so quite encouraging. Personally waiting on affinity to make the jump. Fingers not xd

LocalSend on both devices is something I’ve used

Dark souls 1 & 2 doesnt sound too relaxing :D Mmm Probably Cyberpunk, because of the world they created, fun to hang in. And the newer persona games 3-5 as its just fun characters to hang out with.