Sign up for a commercial email mailing list, but negotiate, at signup, that the emails sent will be exactly in a certain format, a schema. That schema you then program into your mail software or system, which will then reject messages not of that schema. The schema could include a public key. The purpose is to decrease spam, which will likely not be of the schema.
The recipient should be careful not to agree to schemata which are too flexible, which could be abused by spammers.
Provide some method for the sender to request changing the schema.
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