Is dividend.com Safe?

I'm really not sure about this site. After I signed up for their newsletter to my Yahoo account I noticed an increase in the number of messages in the Spam folder there; Yahoo was even catching the newsletters and putting them in the Spam folder. But that account already gets so much spam, it was hard to tell. Recently I decided to sign up again, this time to a Gmail account that I could access with Thunderbird (Yahoo is web only). I don't know why I didn't think to just ask for an address change - but I didn't. When the confirmation came through I remembered the Yahoo spam and started to have second thoughts; the Gmail account was clean up to that point, no spam at all, and I wanted to keep it that way. So I decided not to click the confirmation link. I haven't received any newsletters - but soon after that the Gmail account started getting spam. I can't *prove* it was a direct result of the dividend.com signup but the timing sure was right. I may try a test with a brand-new email account and a newsletter signup just to see what happens. If I do I'll report back here.