Both those sites require that you register with them before doing anything useful with them, and the information you have to give them is worth more to them that what you get back in return. (IMNSHO).
Otherwise, a quick web search turns up an unobfuscated email@example.com, which I would try first. update: as would firstname.lastname@example.org.
• another intruder with the mooring in the heart of the Perl