Chilkat2-Python

Verify Email Recipients

A way to possibly determine valid/invalid email addresses. I would recommend being very careful about doing this because your IP address may be flagged as a potential spammer by the mail server (because you are probing for valid/invalid email addresses). This Chilkat functionality existed for many years, before this kind of activity became a problem. The functionality remains only because it is useful for some to test with their own SMTP servers. Chilkat2-Python

import sys
import chilkat2

success = False

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

mailman = chilkat2.MailMan()

# SMTP connection settings...
mailman.SmtpHost = "smtp.example.com"
mailman.SmtpUsername = "MY_SMTP_USERNAME"
mailman.SmtpPassword = "MY_SMTP_PASSWORD"
mailman.SmtpSsl = True
mailman.SmtpPort = 465

# Create a new email object
email = chilkat2.Email()

email.Subject = "This is a test"
email.Body = "This is a test"
email.From = "myemail@example.com"
success = email.AddTo("person1","person1@example.com")
success = email.AddTo("person2","person2@example.com")
success = email.AddTo("person3","person3@example.com")
# The SMTP server smtp.example.com won't know anything about an email address @somewhere_else.com
success = email.AddTo("person3","person4@somewhere_else.com")
# ...

# Verify recipients.
# **** See the warning about using this API method in the description above.
# (An SMTP server only knows valid email address for its own domain.  For example,
# smtp.example.com *may* only know if person1@example.com is valid or invalid, but does
# not know anything about the validity of email addresses having other domains.)
badAddrs = chilkat2.StringArray()
success = mailman.VerifyRecips(email,badAddrs)
if (success != True):
    print(mailman.LastErrorText)
    sys.exit()

i = 0
while i < badAddrs.Count :
    print(badAddrs.GetString(i))
    i = i + 1

print("done.")