(CkPython) Send Email to Distribution List

Sends the same email to a list of 1000 email addresses in 50 sends where each email has 20 recipients.

Note: Chilkat is not intended nor designed for mass emailing. A solution such as this might be used for a corporate emailing to employees, or an emailing to newsletter subscribers.

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_SmtpHost("smtp.mymailserver.com")
mailman.put_SmtpPort(465)
mailman.put_SmtpSsl(True)
mailman.put_SmtpUsername("myUsername")
mailman.put_SmtpPassword("myPassword")

# Create a new email object
email = chilkat.CkEmail()
email.put_Subject("This is a test")
email.put_Body("This is a test")
email.put_From("Senders Name <sender@example.com>")
email.AddTo("Subscribers","subscribers@example.com")

bdMime = chilkat.CkBinData()
mailman.RenderToMimeBd(email,bdMime)

# Load a file containing one email address per line.
distList = chilkat.CkStringTable()
success = distList.AppendFromFile(1000,"utf-8","qa_data/distList.txt")
if (success == False):
    print(distList.lastErrorText())
    sys.exit()

sbRecipients = chilkat.CkStringBuilder()

i = 0
szDistList = distList.get_Count()
j = 0
while i < szDistList :

    # Build a list of comma-separated recipients.
    if (j > 0):
        sbRecipients.Append(",")

    sbRecipients.Append(distList.stringAt(i))

    i = i + 1
    j = j + 1

    # If we have 20 recipients, or we have the final recipient in the final chunk, then send.
    if ((j == 20) or (i == szDistList)):
        success = mailman.SendMimeBd("sender@example.com",sbRecipients.getAsString(),bdMime)
        if (success != True):
            print(mailman.lastErrorText())
            sys.exit()

        j = 0
        sbRecipients.Clear()

success = mailman.CloseSmtpConnection()
if (success != True):
    print("Connection to SMTP server not closed cleanly.")

print("Email sent to distirbution list.")