CkPython

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. CkPython

import sys
import chilkat

success = False

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

mailman = chilkat.CkMailMan()

# SMTP connection settings...
mailman.put_SmtpHost("smtp.example.com")
mailman.put_SmtpUsername("MY_SMTP_USERNAME")
mailman.put_SmtpPassword("MY_SMTP_PASSWORD")
mailman.put_SmtpSsl(True)
mailman.put_SmtpPort(465)

# 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("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 = chilkat.CkStringArray()
success = mailman.VerifyRecips(email,badAddrs)
if (success != True):
    print(mailman.lastErrorText())
    sys.exit()

i = 0
while i < badAddrs.get_Count() :
    print(badAddrs.getString(i))
    i = i + 1

print("done.")