(CkPython) POP3 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.

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

import sys
import chilkat

success = False

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

mailman = chilkat.CkMailMan()

# Set the POP3 server's hostname
mailman.put_MailHost("pop.example.com")

# Set the POP3 login/password.
mailman.put_PopUsername("myLogin")
mailman.put_PopPassword("myPassword")

stUidls = chilkat.CkStringTable()
success = mailman.FetchUidls(stUidls)
if (success == False):
    print(mailman.lastErrorText())
    sys.exit()

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

count = stUidls.get_Count()
i = 0
while i < count :
    # Download the full email.
    success = mailman.FetchByUidl(stUidls.stringAt(i),False,0,email)
    if (success == False):
        print(mailman.lastErrorText())
        sys.exit()

    print(str(i))
    print("From: " + email.ck_from())
    print("Subject: " + email.subject())

    # 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())

            success = email.LastSignerCert(0,cert)
            if (success == False):
                print(email.lastErrorText())
                sys.exit()

            print("Signing cert: " + cert.subjectCN())

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

    i = i + 1

mailman.Pop3EndSession()