O OpenPGP

You can easily use the OpenPGP protocol (implemented by, among others, GnuPGP) in your MUA for personally signing the emails you send. Making your public key available on public keyservers allows other people to fetch your key and check the validity of your messages. Since this kind of encryption applies to the body of the message only, it's not affected in any way by the delivery process.

It must be noted that signing all your outgoing messages is not a good practice, and it should be kept only for sensitive messages that really need authentication. Signing all your messages, besides wasting bandwidth and requiring you to type your passphrase too often, creates expectations causing every future message that is not signed and/or encrypted to raise suspicion (which shouldn't be the case).

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