Spam Using Email Delivery Notifications To Verify Valid Addresses | TrendLabs | Malware Blog - by Trend Micro（情報元のブックマーク数）
ちょっと前から増えているNDRスパム。実際にアドレスを確認するように誘導するスパムだそうです。
Advanced Threats Researcher Paul Ferguson recently reported of spammers using a feature called ‘delivery receipt request’ to verify if a certain email address exists. Delivery receipts are messages sent to the original sender of an email message to verify that the sent message has been delivered to the intended recipient.
Spam Using Email Delivery Notifications To Verify Valid Addresses - TrendLabs Security Intelligence Blog
While message delivery receipt acknowledgment is indeed available in popular desktop mail clients (such as Microsoft Outlook), and can be selectively ignored, most Web email platforms automatically send a delivery receipt when requested to do so if the targeted account exists.
