Though some readings of the RFCs (RFC stands for Request for Comment--
these documents serve as Internet Standards; see
<URL:http://info.internet.isi.edu/7c/in-notes/rfc/.cache> to search
for RFCs on a certain subject) prohibit spam blocking or header munging,
the desire to avoid spam is legitimate.

We realize that there are many positions on this sometimes controversial
topic.  In fact, if you do not wish to see posts with a munged From:
header, feel free to killfile those posts.  All posters who register
under a munged address will have the following header included in all
approved articles:

    X-Unverified-Address: yes

Newsreaders with decent killfile functionality will allow people who
don't want to read articles with unrepliable addresses to avoid hair
pulling.

Keep in mind, however, that an article that does not contain the
X-Unverified-Address: header is not necessarily automatically
repliable.  People's addresses do change and configuration errors do
occur.  If an article does not have the X-Unverified-Address: header,
that means we were able to send mail to it once--the address may no
longer be valid.  An easy rule of thumb is the X-Unverified-Address:
header (or lack thereof) is merely an indication and not a definitive
statement.