Hard to send documents:

psf-trademarks@python.org: host mail.python.org[82.94.164.166] said:
553-rejected, message looks like spam. 553 Contact your postmaster/admin
for assistance. Please provide the following information in your problem
report: time (Feb 16 15:22:05) and client (129.175.33.41). (in reply to end
of DATA command)