The username in the email address determines where your email gets Autoposted. The username is the part of the email address to the left of the “@” symbol.Normal posts created by emailing post@posterous.com autopost to all your other sites. You can also specify where you want to post via the email address you send to.

You can email to specific service types on your account. Do you want to update your Twitter but not your Facebook? You can do that.

• Email posterous@posterous.com if you don’t want Autopost at all.

• Email a service: twitter@posterous.com to Autopost to just that service type.

• Email multiple services: twitter+facebook@posterous.com to Autopost to all services listed.

You can use the following service names to email to: twitter, facebook, flickr, picasa, blog, blogger, tumblr, youtube, vimeo, friendfeed, delicious, laconica, identica, plurk, shopify.

No matter where you email, we’ll always update your Posterous site. Posts on the external sites will have a post.ly url that links to the Posterous post.