.P7S File Extension
There is only one filetype that uses .P7S file extension and it is Digitally Signed Email Message.
Digitally Signed Email Message
| File category: | Text Files |
|---|---|
| Developer: | N/A |
| Open with: | Microsoft Outlook (+4 more) |
| Platforms: | Windows, macOS, Linux, iOS, Android |
A P7S file is a type of file associated with email messages that include an S/MIME (Secure/Multipurpose Internet Mail Extensions) digital signature. When you receive an email with a P7S file, it’s likely that the message contains sensitive information or comes from a sender who needs to prove their identity. These files allow the recipient to confirm that the email has not been modified in transit and verify the sender's identity using an email signing certificate. In cases where the recipient’s email program does not support digital signatures, the P7S file appears as an attachment, often named smime.p7s. This does not affect the message's content but rather signals that the email has been digitally signed.
The abbreviation P7S is linked to PKCS #7 (Public-Key Cryptography Standards #7), a widely used encryption format for signing emails and securing data. This standard ensures that the sender's identity is verified and protects the message's content from unauthorized alterations.
How to Open .P7S as Digitally Signed Email Message
Opening a P7S file requires an email client that supports S/MIME signatures. Popular applications such as Microsoft Outlook, Apple Mail, Mozilla Thunderbird, and Postbox are equipped to handle P7S files. In these clients, if you're the intended recipient of the email, the P7S file will automatically verify the sender’s identity and check that the message has not been altered. However, if your email client doesn't support S/MIME, the P7S file will simply appear as an attachment, and you might need a third-party application to view its contents.
Applications That Open P7S Files
Windows Apps for P7S Files:
- Microsoft Outlook Free+
- Postbox Free Trial
- Mozilla Thunderbird Free
- P7S Viewer Free Trial
macOS Apps for P7S Files:
- Microsoft Outlook Free+
- Postbox Free Trial
-
Apple Mail
Included with OS - Mozilla Thunderbird Free
Linux Apps for P7S Files:
- Mozilla Thunderbird Free
iOS Apps for P7S Files:
- Microsoft Outlook Free+
Android Apps for P7S Files:
- Microsoft Outlook Free+
- Mozilla Thunderbird Free