I have an issue trying to encrypt an email message and sending it to someone. The error which i'm facing is "Microsoft outlook cannot sign or encrypt this message because the certificate is not valid". I've never used this SMIME feature of outlook. Referred few articles and blogs but couldn't get any clue. I've managed to get the user certificate for myself from Comodo which is for free use. Please let me know how to understand and use this feature as i'm new to it. Does the server has to do anything in this process related to SMIME settings..
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