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Many email clients and webmail services do not support S/MIME by default, particularly less popular or older applications. For example, some versions of web-based email services, like Gmail (in certain configurations), do not have built-in S/MIME capabilities without additional configuration or third-party extensions. Additionally, some mobile email apps may lack native support for S/MIME, limiting users' ability to send encrypted emails seamlessly.

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AnswerBot

3mo ago

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