Which SMTP command is used to identify the envelope sender of an email message?
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Which RFC defines the mailto URI scheme used for email links?
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RFC 6068
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Which Microsoft email client first appeared as part of Microsoft Office 97?
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Microsoft Outlook
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Which email header field lists the main recipients of a message?
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To
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Which email protocol's name is commonly shortened to LMTP?
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Local Mail Transfer Protocol
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Which free webmail application is written in PHP and released under the GNU GPL?
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SquirrelMail