在 Python 中发送多个隐藏收件人的邮件

Answer 1

您不需要发送多条消息。只是不要将收件人明确地放在标题中。

下面通过将收件人放在Bcc: 标头中来实现这一点。

import smtplib 
from email.message import EmailMessage 

email_subject = "Good morning" 
sender_email_address = "user@outlook.com" 
receivers_email_address = ['reciever1@gmail.com', 'reciever2@gmail.com']

email_smtp = "smtp.office365.com" 
email_password = "MyPassword" 

message = EmailMessage() 
message['Subject'] = email_subject 
message['From'] = sender_email_address
# The message needs to have a To: header
# - putting yourself is an old convention
message['To'] = sender_email_address
message['Bcc'] = ",".join(receivers_email_address)

with open('message.html', 'r') as file:
   file_content = file.read()
message.set_content(file_content, subtype='html')

with smtplib.SMTP(email_smtp, '587') as server:
    server.ehlo() 
    server.starttls() 
    server.login(sender_email_address, email_password) 
    server.send_message(message) 
    server.quit()

当然，如果您确实需要To: 标头来指示实际收件人，您将需要为每个人生成一个唯一的消息。

这依赖于 SMTP 服务器来读取和剥离 Bcc: 标头。如果您不能依赖自己的方法来执行此操作，则可以显式使用 smtplib 模块的旧版 sendmail 方法，该方法使您可以将实际收件人列表与消息分开显式传递。然后你也可以避免讨厌的副本给自己。

简单回顾一下，SMTP 并不真正关心 To: 或 Cc: 标头中的内容。在您提交实际消息之前，将单独传达实际的收件人列表。这称为 SMTP信封。

Answer 2

我做了一个循环单独发送。而不是将其发送给一个组中的多个人。

import smtplib
from email.message import EmailMessage

email_subject = "Good morning"
sender_email_address = "user@outlook.com"
receivers_email_address = ['reciever1@gmail.com', 'reciever2@gmail.com']
email_smtp = "smtp.office365.com"
email_password = "MyPassword"



# Read file containing html
with open('message.html', 'r') as file:
    file_content = file.read()

# Set smtp server and port
server = smtplib.SMTP(email_smtp, '587')

# Identify this client to the SMTP server
server.ehlo()

# Secure the SMTP connection
server.starttls()

# Login to email account
server.login(sender_email_address, email_password)

# Send email
for receiver in receivers_email_address:
    # Create an email message object
    message = EmailMessage()
    message['Subject'] = email_subject
    message['From'] = sender_email_address
    message['To'] = receiver
    # Add message content as html type
    message.set_content(file_content, subtype='html')
    server.send_message(message)

# Close connection to server
server.quit()