Emailing content to posterous

[CMCD]

Posterous is setup to syndicate my content to my personal WP blog.

After reading information on SEOmoz, I realize that Duplicate Content is not a good thing.

Should I stop this process?

Note: The way it works is I email a post to posterous and it posts it there and on my WP Blog and create a FB post and a Tweet.

[bridaldesigns]

I'm a complete beginner so probably not much use me replying but I did find that when Networked blogs posted my blog posts to Facebook they did show up as a duplicate content warning, so guessing it's not a good thing? Will be interested to see others responses.