I have been asked some questions about the mailing list header line
after having mail blocked by ISPs for use of the extension
Precedence: junk and Precedence: bulk, both of which I understand are
very appropriate for mailing lists.
Now I can find brief reference to their use in the new Sendmail book
BUT I am unable to find any RFC for their use from first principles
or other places where I can read about these header lines in depth.
Anyone got any pointers?
Thanks. Regards, Andrew