如何在 python 中向多个组发送 smtplib 电子邮件？

Question

import smtplib
from email.message import EmailMessage

list1=[
    'Person 1 <email1@outlook.com>',
    'Person 2 <email2@gmail.com>'
    ]
    
list2=[
    'Person 3 <email3@yahoo.com>',
    'Person 4 <email4@hotmail.com>'
    ]
    
masterlist = [list1, list2]

for x in masterlist:
    receivers = ", ".join(x)

msg = EmailMessage()
msg['Subject'] = 'This is a Test Email'
msg['From'] = 'Person 5 <email5@outlook.com>'
msg['To'] = receivers
msg.set_content('Ignore this message')

with smtplib.SMTP('smtp.outlook.com', 587) as smtp:
    smtp.send_message(msg)

This is the code that I have used.I would like to send this email out to certain groups, but not join all emails into one email. The way I have it now, only ends up sending the email out to the last list of emails. How should I modify this to be able to send it to multiple lists of emails?

Answer 1

You're only passing the last list of emails to msg['To'] because the program overwrites the previous lst assignments with last item in lst. So why want you just concatenate the two lists to send the email to everyone?

#masterlist = [list1, list2]

#for x in masterlist:
   #receivers = ", ".join(x)
# The .join() function doesn't do much in this situation because your lists are already separated by commas.

msg = EmailMessage()
msg['Subject'] = 'This is a Test Email'
msg['From'] = 'Person 5 <email5@outlook.com>'
msg['To'] = list1 + list2 # or use .extend() function the same is accomplished
msg.set_content('Ignore this message')

So just get rid of the masterlist variable and the for loop.

Answer 2

import smtplib
from email.message import EmailMessage

list1=[
    'Person 1 <email1@outlook.com>',
    'Person 2 <email2@gmail.com>'
    ]
    
list2=[
    'Person 3 <email3@yahoo.com>',
    'Person 4 <email4@hotmail.com>'
    ]
    
masterlist = [list1, list2]

for x in masterlist:
    msg = EmailMessage()
    msg['Subject'] = 'This is a Test Email'
    msg['From'] = 'Person 5 <email5@outlook.com>'
    msg['To'] = x
    msg.set_content('Ignore this message')

    with smtplib.SMTP('smtp.outlook.com', 587) as smtp:
        smtp.send_message(msg)

I was able to correct this by making the email section in to a for loop based on the list of emails.