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S/MIME Encrypted Email Example with Gmail and Comodo

A quick how-to installation for secure S/MIME installation for a Gmail account on macOS. This certificate can be used to simultaneously encrypt and sign emails.

Obtain and install an S/MIME Certificate

0. Create a unique revocation passphrase in a password manager—long, random, unique.
1. Browse to Comodo and request a free, secure email certificate:

• Enter your name, email address, and specify the maximum 2048 bit length
• Enter your revocation passphrase in case your private key is ever stolen or compromised

sruehl

package training.domain;

import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.time.temporal.ChronoUnit;