koan - 9:28 pm on Dec 13, 2007 (gmt 0)
There is no such thing as "double opt-in", that's spammer speak. You subscribe only once to a newsletter, and you can use validation by email (recommended) or not (may get you in trouble). Don't complain if you let anyone subscribe any addresses without verification. If more than 0.5% AOL subscribers are reporting you, your mailing list is probably not very clean.