Bulk unsolicited email (so-called "spam") is widely believed to be a problem in today's Internet, especially when the distribution methods used conceal the origins of the sender and exploit the computer and network resources of otherwise-uninvolved third parties. Many, perhaps most, of the issues associated with spam are political and legal, e.g., whether or not it should be permitted, how it is precisely defined, and whether the use of third-party facilities is appropriate or constitues theft of service. Those political and legal issues cannot be effectively addressed by IETF and will not be discussed in this BOF. However, for the user who would prefer to not receive such traffic, or the MTA operator who would prefer to not relay or expand it, some technical measures may be feasible. This BOF will review the possible technical mechanisms, including the potential for protocol changes that would better control unsolicited or unauthorized mailings, and determine whether a working group on the subject should be recommended to the IESG. Since, where this topic is concerned, ideas are many and time is short, anyone wanting to express an opinion should prepare either a position statement (in ascii text) or a short (not to exceed five minutes) presentation in HTML format and email it to ietf-ube-bof-submit@imc.org prior to the start of IETF. Relevant contributions from those who expect to be present at the BOF will be posted to http://www.imc.org/ietf-ube-bof/ and given priority for BOF time and discussion (unless there is extra time, those who do not submit materials in advance should not expect to be heard at the BOF). Presentations which are submitted will be available on a projector. Contributions that do not represent technical / engineering proposals, and particularly those that propose legislation or retaliation, will not be posted. As is usual with IETF sessions, discussion will be much better (and there will be more time for it) if materials are reviewed by all participants in advance. If there is little time relative to the number of presentations, the chair will assume that the BOF participants will have read all of the materials on the web page.