為了遏制網絡中大量存在的垃圾郵件，需要對網絡中傳輸的郵件信息進行獲取，以實
現垃圾郵件的恰當過濾。本文通過分析郵件傳輸的兩種方式，討論了與郵件信息獲取相關的若干問題，主要包括網絡數據包的捕獲與重組、基于SMTP/POP3 協議的郵件信息獲取技術以及基于HTTP 協議的Webmail 郵件信息獲取技術。實際應用表明，本文所討論的郵件信息獲取技術具有較大實用價值，為實現垃圾郵件的過濾奠定了重要的技術基礎。
關鍵詞：簡單郵件傳輸協議；郵局協議3；Webmail 郵件；網絡數據包捕獲；郵件信息獲取
Abstract: To reject spam on the internet, mail information transmitted on the network should be captured in order to filter the spam properly. By analyzing two typical ways through which e-mails are transferred, this paper discussed some issues about mail information extraction, including capturing and reordering of the network packages, extracting of mail information based on SMTP/POP3 and HTTP. Practical application indicates that those mail information extraction techniques have certain practical value and founds a firm technology base for spam filtering.
Key words: SMTP, POP3, Webmail, Network package capture, Mail information extraction