RFC 2505 Anti-Spam Recommendations for SMTP MTAs
This memo gives a number of implementation recommendations for SMTP,
, MTAs (Mail Transfer Agents, e.g. sendmail, ) to make them
more capable of reducing the impact of spam(*).
The intent is that these recommendations will help clean up the spam
situation, if applied on enough SMTP MTAs on the Internet, and that
they should be used as guidelines for the various MTA vendors. We are
fully aware that this is not the final solution, but if these
recommendations were included, and used, on all Internet SMTP MTAs,
things would improve considerably and give time to design a more long
term solution. The Future Work section suggests some ideas that may
be part of such a long term solution. It might, though, very well be
the case that the ultimate solution is social, political, or legal,
rather than technical in nature.
The implementor should be aware of the increased risk of denial of
service attacks that several of the proposed methods might lead to.
For example, increased number of queries to DNS servers and increased
size of logfiles might both lead to overloaded systems and system
crashes during an attack.
A brief summary of this memo is:
Copyright © 2004 Contact: Dave Wanta.