(CkPython) Process Large POP3 Mailbox

Demonstrates how to read email from a mailbox that may contain a large number of emails.

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

import sys
import chilkat

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

mailman = chilkat.CkMailMan()

mailman.put_MailHost("pop.example.com")

mailman.put_PopUsername("myLogin")
mailman.put_PopPassword("myPassword")

mailman.put_MailPort(995)
mailman.put_PopSsl(True)

# Get the list of UIDLs for all emails in the mailbox.
# sa is a CkStringArray
sa = mailman.GetUidls()
if (mailman.get_LastMethodSuccess() == False):
    print(mailman.lastErrorText())
    sys.exit()

numEmails = sa.get_Count()
if (numEmails == 0):
    print("Mailbox is empty")
    sys.exit()

chunkSize = 6

# Download the emails in chunks of 6 emails each.
chunkBeginIdx = 0
chunkEndIdx = chunkSize - 1
if (chunkEndIdx >= numEmails):
    chunkEndIdx = numEmails - 1

saChunk = chilkat.CkStringArray()
while (chunkBeginIdx < numEmails) :

    print(str(chunkBeginIdx) + " to " + str(chunkEndIdx))

    # Build a chunk of UIDLs.
    saChunk.Clear()
    for i in range(chunkBeginIdx,(chunkEndIdx)-1):
        saChunk.Append(sa.getString(i))

    # Log the UIDLs in this chunk...
    chunkStr = saChunk.saveToText()
    print(chunkStr)

    # Download this chunk of email from the POP3 server.
    # bundle is a CkEmailBundle
    bundle = mailman.FetchMultiple(saChunk)
    if (mailman.get_LastMethodSuccess() == False):
        print(mailman.lastErrorText())
        sys.exit()

    print("Downloaded " + str(bundle.get_MessageCount()) + " emails.")
    print("----")

    # Process the bundle...
    # (your application's processing code goes here...)

    # Get the next chunk...
    chunkBeginIdx = chunkBeginIdx + chunkSize
    chunkEndIdx = chunkEndIdx + chunkSize
    if (chunkEndIdx >= numEmails):
        chunkEndIdx = numEmails - 1