[e2e] reminder about 'held posts'

[Joe Touch]

Hi, all,

Because the list is now subscriber-only in order to reduce spam, there 
is new info on what to do when a post is 'held' - for ANY reason:

WHAT THIS MEANS FOR POSTERS:

HELD POSTS ARE DISCARDED
All posts go to the same queue - spam, policy-based filters, and 
non-member posts. This list gets large quickly, and it is not feasible 
to manually triage.

As a result, ALL HELD POSTS ARE DISCARDED. Please see the following on 
how to repost:

---------

IF YOUR POST IS HELD FOR "NON-MEMBER":
If you receive a "non member post" reply, please subscribe and repost. 
Messages held for non-member post review will be accumulated along with 
spam, which means it will not be possible to actively or regularly 
review them for content.

IF YOUR POST IS HELD FOR ANY OTHER REASON (usually "SUSPICIOUS HEADER"):
If you receive a 'held for post' message and are a membe - for any 
reason (e.g., suspicious header), please forward the message to 
end2end-interest-admin at postel.org, and it will be posted indirectly. 
Such requests should NOT include attachments or be otherwise 
MIME-encoded, and should be brief.

Joe (list admin)