> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.flexbox.cloud/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# What should I do if I have lost my S/MIME Certificate?

If you have a backup of the S/MIME Certificate in PKCS#12 format, you can recover it from the backup. 

If you don't have a backup of the certificate, you will not be able to read any old emails encrypted using the lost certificate.

If your S/MIME Certificate is within its validity period, you can request the reissue of the certificate free of charge, but you will not be able to read any old emails encrypted using the lost certificate.


If you don't have an S/MIME Certificate or need to renew your existing one, check out our offerings: [https://flexbox.cloud/en/secure-email-smime-certificate/](https://flexbox.cloud/en/secure-email-smime-certificate/)