(Chilkat2-Python) IMAP Download and Verify Signed (S/MIME) Email

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

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS

import sys
import chilkat2

success = False

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

imap = chilkat2.Imap()

# Connect to an IMAP server.
# Use TLS
imap.Ssl = True
imap.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 = chilkat2.MessageSet()
success = imap.QueryMbx("ALL",fetchUids,messageSet)
if (success == False):
    print(imap.LastErrorText)
    sys.exit()

email = chilkat2.Email()
cert = chilkat2.Cert()

i = 0
while i < messageSet.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.ReceivedSigned == True):

        print("This email was signed.")

        # Check to see if the signatures were verified.
        if (email.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()