DKIM/SPF/DMARC DNS Records

meiendreschlars@gmail.com
   Letzter Fehler: 550 5.0.0 
   Erklärung: host gmail-smtp-in.l.google.com [64.233.167.26:25] said: 5.7.26 Your 
              email has been blocked because the sender is 
              unauthenticated. 5.7.26 Gmail requires all senders to 
              authenticate with either SPF or DKIM. 5.7.26  5.7.26  
              Authentication results: 5.7.26  DKIM = did not pass 
              5.7.26  SPF [19squared.de] with ip: [81.169.146.220] = 
              did not pass 5.7.26  5.7.26  For instructions on setting 
              up authentication, go to 5.7.26  
              https://support.google.com/mail/answer/81126#authenticatio
              n ffacd0b85a97d-37ee0b9b463si4513547f8f.650 - gsmtp

import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from dkim import Signer

# ... (other email setup code)

# Create a DKIM signer
signer = Signer('your_private_key_path', 'your_domain.com')

# Create an email message
message = MIMEMultipart()
message['From'] = 'Sender Name <sender@example.com>'
message['To'] = 'Recipient Name <recipient@example.com>'
message['Subject'] = 'Subject'
message.attach(MIMEText('Email body'))

# Sign the message
signer.sign(message)

# Send the email
with smtplib.SMTP('smtp.example.com', 587) as smtp:
    smtp.starttls()
    smtp.login('your_username', 'your_password')
    smtp.sendmail(message['From'], message['To'], message.as_string())