11. Organization of this document
This document is organized into the following chapters:
- Background
General introduction to SMTP time filtering, and to SMTP.
- Techniques
Various ways to block junk mail in an SMTP transaction.
- Considerations
Issues that pertain to transaction time filtering.
- Questions & Answers
My attempt at anticipating your questions, and then answering them.
A sample Exim implementation is provided in Appendix A.