Upgrade SMTP client to use the (new) settings infrastructure - #1701

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Line matches candidate pattern (base64 encoded content) ``([`'"])[-a-zA-Z=;:/0-9+]+=\g{-1}`` (candidate-pattern)

Line matches candidate pattern (base64 encoded content) ``([`'"])[-a-zA-Z=;:/0-9+]+=\g{-1}`` (candidate-pattern)

Line matches candidate pattern (base64 encoded content) ``([`'"])[-a-zA-Z=;:/0-9+]+=\g{-1}`` (candidate-pattern)