email_sender_with_attachments.py

import smtplib
from email import encoders
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from bs4 import BeautifulSoup as bs

# list of files to send as an attachment to the email
# feel free to add your attachments here
files_to_send = [
    "test.txt",
    "1810.04805.pdf",
]


def send_mail(email, password, FROM, TO, msg):
    # initialize the SMTP server
    # in our case it's for Microsoft365, Outlook, Hotmail, and live.com
    server = smtplib.SMTP(host="smtp.office365.com", port=587)
    # connect to the SMTP server as TLS mode (secure) and send EHLO
    server.starttls()
    # login to the account using the credentials
    server.login(email, password)
    # send the email
    server.sendmail(FROM, TO, msg.as_string())
    # terminate the SMTP session
    server.quit()

# your credentials
email = "email@example.com"
password = "password"

# the sender's email
FROM = email
# the receiver's email
TO   = "to@example.com"
# the subject of the email (subject)
subject = "Just a subject"

# initialize the message we wanna send
msg = MIMEMultipart("alternative")
# set the sender's email
msg["From"] = FROM
# set the receiver's email
msg["To"] = TO
# set the subject
msg["Subject"] = subject
# set the body of the email as HTML
html = open("mail.html").read()
# make the text version of the HTML
text = bs(html, "html.parser").text

text_part = MIMEText(text, "plain")
html_part = MIMEText(html, "html")
# attach the email body to the mail message
# attach the plain text version first
msg.attach(text_part)
msg.attach(html_part)

for file in files_to_send:
    # open the file as read in bytes
    with open(file, "rb") as f:
        # read the file content
        data = f.read()
        # create the attachement
        attach_part = MIMEBase("application", "octet-stream")
        attach_part.set_payload(data)
    # encode the data to base 64
    encoders.encode_base64(attach_part)
    # add the Content-Disposition header
    attach_part.add_header("Content-Disposition", f"attachment; filename= {file}")
    msg.attach(attach_part)

# send the mail
send_mail(email, password, FROM, TO, msg)