email client software
电子邮件客户端软件
以上为机器翻译结果，长、整句建议使用 人工翻译 。
For starters, the couple could have used stress-tested PGP (Pretty Good Privacy) for point-to-point encrypted email which involves installing a separate piece of client software and the exchanging of public keys.
FORBES: The General, The Biographer, And Unencrypted Email
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