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.P7S File Extension

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File TypeDigitally Signed Email Message

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CategoryText Files


File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.


Email message that includes a digital signature; can be used for sending secure emails that can only be viewed by the intended recipient; verifies that the email is from who it claims to be from and that the email has not been modified in transit.

More Information

If an email program does not handle digital signatures, a P7S file may appear as an attachment (smime.p7s) to the email message.

NOTE: Email programs that use P7S files use PKCS (Public-Key Cryptography Standard) #7 to sign email messages.

Program(s) that open .P7S files
Microsoft Windows LogoWindows
Microsoft Outlook 2013
Mozilla Thunderbird
Mac OS X LogoMac OS
Apple Mail
Mozilla Thunderbird
Linux LogoLinux
Mozilla Thunderbird
Updated 12/19/2011