this post was submitted on 11 Jun 2026
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Privacy
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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.
I 100% did set them up from day one, and for several months every mail I sent from my domain to gmail got rejected, so I stopped trying.
I did a couple of tests today and it seems to be working now, so I guess they are doing more than just looking at the DNS records.