Can an encrypted message be read in a web mail client?
Yes, if you have an appropriate private key installed in the system or stored in a PKCS#12 (.pfx or .p12) file, p7mViewer will decrypt the message for you and give all access to its contents. An encrypted message is shown by a web mail client as an email with no text content with a single smime.p7m attachment. To view your message, download and install p7mViewer. Then save the smime.p7m attachment to a local drive and double click it. It will open in p7mViewer and you will be able to read the decrypted content, provided you have the private keys. If the message cannot be decrypted, p7mViewer will inform you about exact reasons.