(Chilkat2-Python) How to Download Messages in MessageSet One at a Time

If a message set contains a huge number of emails, it's NOT a good idea to try to download all at once into an email bundle using a method such as FetchBundle. It's better to iterate over the messages in the set to download one by one.

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

import sys
import chilkat2

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

imap = chilkat2.Imap()

# Connect using TLS.
imap.Ssl = True
imap.Port = 993
success = imap.Connect("imap.example.com")
if (success != True):
    print(imap.LastErrorText)
    sys.exit()

# Authenticate
success = imap.Login("email_account_login","email_account_password")
if (success != True):
    print(imap.LastErrorText)
    sys.exit()

# Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
if (success != True):
    print(imap.LastErrorText)
    sys.exit()

# Search for messages and return a set of matching messages.
# (This example will simply search for ALL messages.)
fetchUids = True
# messageSet is a CkMessageSet
messageSet = imap.Search("ALL",fetchUids)
if (imap.LastMethodSuccess != True):
    print(imap.LastErrorText)
    sys.exit()

print("Number of messages = " + str(messageSet.Count))

i = 0
while i < messageSet.Count :
    # email is a CkEmail
    email = imap.FetchSingle(messageSet.GetId(i),fetchUids)
    if (imap.LastMethodSuccess != True):
        print(imap.LastErrorText)

        sys.exit()

    print(email.From + "; " + email.Subject)

    i = i + 1

print("OK")