That's using the FP form, but not a standard mailto hyperlink.
There has to be other ways, such as doing a mail out from your email
program.
However on a web page, you assumably can separate recipients such as:
mailto:
[email protected];
[email protected]; (e-mail address removed) etc - separated
with semi-colons.
I don't know how many (depends on your definition of a "mass mail
out").....but too many would be considered spam. My firewall can limit the
number of emails I can send in one go hence, if a worm/virus/trojan tries to
use my email to send email out from my machine my firewall will alert me if
the number of recipients is more than "x".