Review on Guerrilla Mail by Jorge Maertz

I like that you can send out mass emails to people in your database with just one click of button, without having to log into each account individually or have them subscribe separately. It's also very easy for recipients to unsubscribe from future mailings if they don't want it anymore. The only downside is there are no rules set up so sometimes we get spammy messages through our list which makes us look bad as well as annoying those who do actually wish to receive information about what we offer! We use this product at least once per month during campaigns when sending lots of info via bulk mailing (upwards of 20k contacts). This saves hours over manually logging everyone into their own accounts, adding all relevant details etc.