Note: This feature is for ZCS Network Edition only and is available only in the Advanced Zimbra Web Client.
The contact page in the Address Book includes a Certificate field. When a message with a certificate is received from someone listed in your address books, the certificate is stored in the recipients contact page in the address book.
If a signed message is received from a recipient who is not an existing contact in your address book, a new contact is automatically created in the Collected Certificates address book and the certificate is stored with the newly generated contact.
You can also upload the recipient’s certificate if it sent as an attachment.