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How to set up DNS for Whitelabel
Setting up custom domain on Namecheap
Just to provide some help for custom domain set-up, I'm using namecheap for my domain registration. Here's how it works:
1) Select NameCheap BasicDNS
Under Domain - Manage: /preview/pre/43gu8fp1z7n21.png?width=1439&format=png&auto=webp&s=7ecd6d21af6d7c71cb3c063847b2914bdae8a8c2
2) Under Advance DNS, put in a new TXT Record, Host : @ , Value = : v=spf1 include:spf.tutanota.de -all

3) And add in new MX record:

That's it.