Yes. But you first need to get the email address for the forum you want to post in. To do that:
- Go to the forum you want to post in (for example, Photoshop Lightroom at http://forums.adobe.com/community/lightroom)
- Click on the Create by email link in the Actions panel
- Right-Click or Control-Click (Mac) on the Start a discussion now link
- Copy the email address
- Go into your E-mail program and paste the address into the TO: field of your message
You may also want to create an adress book entry for the forum in your email program for future use.