CkPython

IMAP Download and Verify Signed (S/MIME) Email

See more IMAP Examples

Demonstrates how to download and verify digitally signed S/MIME email. CkPython

import sys
import chilkat

success = False

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

imap = chilkat.CkImap()

# Connect to an IMAP server.
# Use TLS
imap.put_Ssl(True)
imap.put_Port(993)
success = imap.Connect("imap.example.com")
if (success == False):
    print(imap.lastErrorText())
    sys.exit()

success = imap.Login("myLogin","myPassword")
if (success == False):
    print(imap.lastErrorText())
    sys.exit()

# Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
if (success == False):
    print(imap.lastErrorText())
    sys.exit()

# We can choose to fetch UIDs or sequence numbers.
fetchUids = True

# Get the message IDs of all the emails in the mailbox
messageSet = chilkat.CkMessageSet()
success = imap.QueryMbx("ALL",fetchUids,messageSet)
if (success == False):
    print(imap.lastErrorText())
    sys.exit()

email = chilkat.CkEmail()
cert = chilkat.CkCert()

i = 0
while i < messageSet.get_Count() :

    uid = messageSet.GetId(i)
    print("uid: " + uid)

    success = imap.FetchEmail(False,uid,True,email)
    if (success == False):
        print(imap.lastErrorText())
        sys.exit()

    # The security layers of signed and/or encrypted emails
    # are automatically "unwrapped" when loaded into
    # a Chilkat email object.
    # An application only needs to check to see if an email
    # was received signed or encrypted, and then examine
    # the success/failure.  For example:
    if (email.get_ReceivedSigned() == True):

        print("This email was signed.")

        # Check to see if the signatures were verified.
        if (email.get_SignaturesValid() == True):
            print("Digital signature(s) verified.")
            print("Signer: " + email.signedBy())

            # Get the certificate used for signing.
            success = email.LastSignerCert(0,cert)

            if (success == False):
                print("Failed to get signing certificate object.")
            else:
                print("Signing cert: " + cert.subjectCN())

        else:
            print("Digital signature verification failed.")

    i = i + 1

# Disconnect from the IMAP server.
success = imap.Disconnect()