Two filters: filter all not encrypted emails; allow not encrypted emails but with attached public OpenPGP key.

[simon-liebehenschel]

Use case

I want to force all people who contact my custom domain to either use encryption or at least attach a public OpenPGP key.

• I have a custom domain (e.g. example.com)
• I want to accept emails for my domain only when a message is encrypted with OpenPGP or not encrypted but have an attached public key.

Note: I am not a guru in OpenPGP and I am not sure if "signed email" is the same as "an email with an attached public key".
Anyway, you got the idea.

Is there any easy way to implement this feature on the Anonaddy side?

Is there any way to use a third-party service to filer non-encrypted emails or emails without an attached public key?

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UPDATE:

Technically, I want something like this Checking encryption status of email.