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(Python) POP3 Verify Signed (S/MIME) Email

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

Chilkat Python Downloads

Python Module for Windows, Linux, MAC OS X,
Solaris, FreeBSD, and ARM Embedded Linux

import sys
import chilkat

mailman = chilkat.CkMailMan()

#  Any string argument automatically begins the 30-day trial.
success = mailman.UnlockComponent("30-day trial")
if (success != True):
    print(mailman.lastErrorText())
    sys.exit()

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

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

# sa is a CkStringArray
sa = mailman.GetUidls()
if (sa == None ):
    print(mailman.lastErrorText())
    sys.exit()

n = sa.get_Count()

for i in range(0,n):

    uidl = sa.getString(i)

    # email is a CkEmail
    email = mailman.FetchEmail(uidl)
    if (email == None ):
        print(mailman.lastErrorText())

        sys.exit()

    print(email.ck_from())
    print(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())

            #  The certificate used for signing may be obtained
            #  by calling email.GetSignedByCert.

            # cert is a CkCert
            cert = email.GetSignedByCert()
            if (cert == None ):
                print("Failed to get signing certificate object.")
            else:
                print("Signing cert: " + cert.subjectCN())

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

success = mailman.Pop3EndSession()

 

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