File Extension Library

.P7S File Extension

  • Category: Text Files

What are .P7S files and how to open them?

Can't open .P7S file? Are you wondering what it contains? On our site we will explain to you what this file is, what it is used for and what software opens the .P7S file.

What is a .P7S file extension?

.P7S file extension has been classified as Text Files.

.P7S is Digitally Signed Email Message

A P7S file is an email message that includes a digital signature. It can be used for sending secure emails that can only be viewed by the intended recipient. P7S files verify that the email is from who it claims to be from and that the email has not been modified in transit.

Most email applications, such as Microsoft Outlook, Apple Mail, and Mozilla Thunderbird, support digital signatures. However, 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.

List of all softwares that can open the Digitally Signed Email Message
Microsoft Outlook 2016
Mozilla Thunderbird
Apple Mail
Mozilla Thunderbird
Mozilla Thunderbird

How to fix problems with .P7S files

  1. You need to update the application that you normally use to open .P7S files. Only the latest version of the software supports the current .P7S file format
  2. You need to check the .P7S file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)