This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Difficult. There is no one delivery failure flag defined in SMTP, so its up to the server implementation how they flag this (if they flag it at all.) You can set Flags on you JavaMail messages - you could try to uses them. But see RFC 1221 for a good exploration of why this is so hard. [ April 05, 2004: Message edited by: eammon bannon ]