You can post messages to a discussion either by starting a new thread or replying to a previously posted message.
To post a message to the discussion, folow these steps:
Note: You must have Discussions - Message Post permission for the discussion. You get this permission by subscribing to the discussion. If you don't have this permission, contact your project manager.
Note: You can attach files to your message. To see what types of files are allowed, contact your project manager. Certain types of attachments can be configured to be filtered out at the time of creating the discussion. If your attachment belongs to the "Denied Type" then it will be discarded.
Note: If the discussion owner allows it, you can also post messages to a discussion by email. The email address of a discussion is something like this:
<discussion name>@<project name>.<domain>. You can turn off this email option for your subscription at any time through the Subscription Settings page.