Xplico is an open source Network Forensic Analysis Tool (NFAT) that allows for data extraction from traffic captures. It supports extraction of mail from POP, IMAP, and SMTP, can extract VoIP streams, etc. This is the version that has a GUI allowing you to view photos, texts and videos contained in MMS messages.
Changes: SQLite dispatcher performance improved. Multiple dissectors added, fixed, and improved. Yahoo Webmail bugs fixed. Various other additions and improvements.