S/MIME Certificate and GMail

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So i was asked to have x.509 certificate for a client e-mail.
that client happen to use Gmail, which do have a document on how to install that if you are using Gsuite.

the problem is it's only enterprise version!, why for a simple feature like that i have to go enterprise level.

i would say even free Gmail users should have the ability to use their own S/MIME Personal X.509 certificates to sign and encrypt e-mails.

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