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//usr/lib/python3/dist-packages/certbot/notify.py
"""Send e-mail notification to system administrators.""" import email import smtplib import socket import subprocess def notify(subject, whom, what): """Send email notification. Try to notify the addressee (``whom``) by e-mail, with Subject: defined by ``subject`` and message body by ``what``. """ msg = email.message_from_string(what) msg.add_header("From", "Certbot renewal agent <root>") msg.add_header("To", whom) msg.add_header("Subject", subject) msg = msg.as_string() try: lmtp = smtplib.LMTP() lmtp.connect() lmtp.sendmail("root", [whom], msg) except (smtplib.SMTPHeloError, smtplib.SMTPRecipientsRefused, smtplib.SMTPSenderRefused, smtplib.SMTPDataError, socket.error): # We should try using /usr/sbin/sendmail in this case try: proc = subprocess.Popen(["/usr/sbin/sendmail", "-t"], stdin=subprocess.PIPE) proc.communicate(msg) except OSError: return False return True