recommend me an email signup wordpress plugin

I highly recommend the plug-in, opt-in monster. This is not a free plug-in though but worth the investment. Hope that helps
For the most basic signup form, i'm using "MailChimp for Wordpress Lite". It's very easy to install and setup, and free. You sign up with MailChimp to organize your mailing list (also free up untill a few thousand subscribers).
I use OptinMonster its an absolute gem of a plugin allround for all your capture needs, split testing feature along is worth its weight in Gold.
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