Is it safe to read Emails, Bank Documents, etc in Spreeder?

http://www.spreeder.com/

Only copy/paste it within the thing,
would they manage to/try for getting the emails
Would it be safe and sound to learn stuff of which on this

I will think with care before placing e-mails with there plus, for several, I would likely NEVER spot bank documents ANYWHERE over the internet as loan company documents tend to be private plus should remain doing this!