linux smtp 认证

sudo apt-get update
sudo apt-get install postfix courier-authlib libpam-courier

myhostname = mail.example.com
mydomain = example.com
myorigin = $mydomain
inet_interfaces = all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
relay_domains = $mydestination

# 启用SMTP认证
smtpd_banner = $myhostname ESMTP $mail_name
smtpd_recipient_restrictions =
    permit_mynetworks,
    permit_sasl_authenticated,
    reject_unauth_destination
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous

service auth {
  unix_listener /var/spool/postfix/private/auth {
    mode = 0660
    user = postfix
    group = postfix
  }
}

sudo systemctl restart postfix
sudo systemctl restart dovecot

import smtplib
from email.mime.text import MIMEText

msg = MIMEText('This is the body of the email')
msg['Subject'] = 'Subject'
msg['From'] = 'sender@example.com'
msg['To'] = 'recipient@example.com'

server = smtplib.SMTP('mail.example.com', 587)
server.starttls()
server.login('username', 'password')
server.send_message(msg)
server.quit()