What is a smime.p7s File and How to Open It?
What is a S/MIME.p7s File?
However, before anyone can make use of S/MIME in an email application, an Email and Document Signing Certificate has to be obtained from a publicly recognized CA, such as Comodo. And, once the Email Signing certificate file is purchased and installed on the user’s computer, they will be able to send the digitally signed emails with a digital signature, which comes in the SMIME.p7s file format.
If your email client such as Outlook has installed an Email Signing certificate and has signed the outgoing message, it will automatically send a smime.p7s file along with the outgoing message.
For example, in outlook, an email signed with a trusted certificate can be found by clicking on the red ribbon.
Other Email Hosts
How to Open an SMIME.p7s File?
- On your computer, open the folder which contains the P7S file.
- Double click the file.
- From the list of default applications, select “Microsoft Outlook 2010” and click “Open.”
Who Needs Email Signing Certificate?
- Verifying the identity of the sender of the email to know that the message is authentic
- Alerting you if the document or the email is tampered and it can even restrict access
- Finally, it helps in encrypting an email message so that only the intended recipient can read it
Nevertheless, sometimes it happens that you may find the smime.p7s file as an attachment, especially if you’re using other email hosts such as Gmail. If that’s the case, then no need to worry, it’s completely safe to trust that email. It simply means that email host which you’re using doesn’t support .p7s file like Outlook and it’s displayed as an attachment.