Posterous is a blogging system that launched with an interesting twist — everything happens via email from signup to posting. Since the launch of our post by email features in addition to things like email comment replies and blog subscriptions we’ve been receiving more inquiries from people wanting to graduate from Posterous to a full blog with the features, flexibility, and reliability of WordPress.com.

It was actually easier than we thought: Posterous has a very nice API for reading from and writing to their service.

After logging into your WordPress.com Dashboard, click on Tools -> Import.

Click on the Posterous importer.

Type in your Posterous host name, user name, and password and click the Submit button.

The importer will validate your user name and password. After starting the importer, you can sit back and watch the status counters tick away.

You can also safely leave the importer page or close your browser. The importer will keep running.

Currently, the importer can import posts, tags, comments, and image attachments.

We will send you an email when the import finishes. Easy peasy!

There are a few things still on our roadmap, like more auto-post functionality, but don’t worry it’ll all be ready soon.