Python: Sending email from custom domain

Question

I am trying to send an email from a custom domain in Python. I have figured out how to send emails from other domains, like gmail.com, using smtplib [example code]. Now I want to figure out how to send an email from a custom domain like catsareonwheels.com.

I thought I would be able to use smtpd to send emails from a server, but that library appears only to serve as a proxy fora Mail Transfer Agent. From what I can tell, there are MTA's written in Pure Python [e.g. Slimta], but I have not been able to find any examples of snippets that actually demonstrate how to send an email from a custom domain with Python.

If anyone can help point me toward literature that might help me determine how best to achieve this goal, I'd be very grateful.

Answer 1

TO SEND AN EMAIL FROM A CUSTOM DOMAIN, YOU DO THE FOLLOWING:

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

msg = MIMEMultipart()
msg["From"] = "<your_mail_account>"
msg["To"] = "<destiny_account>"
body_text = "HOLA MUNDO :)"
body_part = MIMEText(body_text, 'plain')
msg.attach(body_part)
with smtplib.SMTP(host="smtp.<CUSTOM_DOMAIN>.com", port=587) as smtp_obj:  # ENVIAR DESDE UN DOMINIO PERSONALIZADO.
    smtp_obj.ehlo()
    smtp_obj.starttls()
    smtp_obj.ehlo()
    smtp_obj.login("<your_mail_account>", "<your_password>")
    smtp_obj.sendmail(msg['From'], [msg['To'],], msg.as_string())

print("¡Datos enviados con éxito!")

That's all :) Hope you like it!