Hi Dennis,
It is conventional NG etiquette - not to mention plain good manners - not to
send unsolicited attachments to volunteer, peer to peer, contributors.
I assume this would not be considered spam as you advertise the address.
The very fact that Bob has intentionally disguised his address should have
alerted you to the fact that spam - unsolicited attachments especially
included - is not welcomed by him.
Having ignored such obvious precepts, you compound matters by being
gratuitously rude and offensive.
Bob has responded to many thousands of queries in these groups and your
response does him an unwarranted disservice; it also displays a deep-seated
ingratitude for the assistance which is provided so bountifully and without
charge in these NGs.
Bob is in the very vanguard of such assistance and I think that an
unqualified retraction and apology would not be inappropriate.
I shall not, however, hold my breath!