send_email.py

#! python3.7
from email.message import EmailMessage
import smtplib
from pathlib import Path


def send_simple_message(email, subject, html, from_subject="Company Name", bcc="", attachment=None):
    from_address = 'no-reply@domain.com'
    auth_user = ''
    auth_password = ''
    smtp_host = 'email-smtp.eu-west-1.amazonaws.com'
    smtp_port = 587

    def attach_file(email, filepath, extention, filename):
        types = {
            'docx': 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
            'pdf': 'application/pdf'
        }
        maintype, subtype = types[extention].split('/', 1)
        with open(filepath, 'rb') as content_file:
            content = content_file.read()
            email.add_attachment(content, maintype=maintype, subtype=subtype, filename=filename)
        return email

    def create_email_message(from_address, to_address, subject, body, bcc):
        msg = EmailMessage()
        msg['From'] = "%s <%s>" % (from_subject, from_address)
        msg['To'] = to_address
        msg['Bcc'] = bcc
        msg.set_content(body, subtype='html')
        msg.add_header('Subject', subject)
        return msg

    msg = create_email_message(from_address, email, subject, html, bcc)
    if attachment:
        msg.make_mixed()
        if not isinstance(attachment, list):
            attachment = [attachment]
        for item in attachment:
            filename = Path(item).name
            subtype = str(Path(filename).suffix).replace('.', '')
            msg = attach_file(msg, item, subtype, filename)

    with smtplib.SMTP(smtp_host, port=smtp_port) as smtp_server:
        smtp_server.ehlo()
        smtp_server.starttls()
        smtp_server.login(auth_user, auth_password)
        smtp_server.send_message(msg)