@taladar
consider validate.email and py3-validate-email
+````import re
import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart

server = smtplib.SMTP_SSL(‘smtp.example.com’, 465)

try:
server.login(‘sender@example.com’, ‘password’)

msg = MIMEMultipart()
msg['From'] = 'sender@example.com'
msg['Subject'] = 'Test email'

body = 'This is a test email sent using Python.'
msg.attach(MIMEText(body, 'plain'))

email_list = [
    'recipient1@example.com',
    'recipient2@example.com',
    'recipient3@example.com'
]

for email in email_list:

    email_regex = r'^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$'
    if re.match(email_regex, email):

        msg['To'] = email
        server.sendmail('sender@example.com', email, msg.as_string())
        print(f'Sent test email to {email}')
    else:
        print(f'Invalid email: {email}')

except Exception as e:
print(f’Error: {e}')

finally:
server.quit()````

now the DNS erno is there, totally normal as I display here and just used examples.
w3schools.com/python/trypython…