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How to Configure MX records for a subdomain on ProtonMail

If you are configuring a subdomain to use ProtonMail, it works well though the ProtonMail instructions aren't clear.  Here's what you need to do.

 

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Say your subdomain is secure.domain.org

The ProtonMail instructions indicate that you should use @ for the host, this is equivalent to domain.org, so it's not what you want. Depending on your how your name server manages your DNS records, instead of @ you want to use either secure or secure.domain.org 

I've also noticed that it takes longer than I expected for the change to propagate, so make the change to your DNS MX record, wait an hour or so and check your ProtonMail dashboard (Settings > Domains > Custom Domains).

Propagation could take longer depending on the TTL setting for this MX record.

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