From the Debian site:
Mailing list advertising policy
This policy is intended to fight mailing-list "spamming".
The Debian Linux mailing lists accept commercial advertising for payment. We
offer a fee waiver if you can show us the canceled check for a $1000 (U.S.)
or more donation to
"Software in the Public Interest" (SPI). One donation per advertisement,
please. If you don't wish to donate, simply post your advertisement to the
list, and the operator of the mailing lists
will bill you $1999 (U.S). The list operator will donate this amount, minus
the expense of collecting it, to SPI. Please note that the lists are
distributed automatically - messages are
generally not read or checked in any way before they are distributed.
By the act of posting your advertisement you agree to accept responsibility
for the fee, you agree to indemnify the mailing-list operator against any
legal claims from you or others in
connection with your advertisement, and you agree to pay any legal and
business expenses incurred in collecting late payment. Our liability to you
is limited to a good-faith effort to deliver
Reduced rates and/or waiver of fee are available for Debian-related
advertisements. You must consult the mailing-list operator in advance of
posting for any reduction or fee waiver.
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