Agent Expiry Gnus Unplugged Agent Variables
When Gnus is unplugged, all outgoing messages (both mail and news) are stored in the draft groups (see Drafts). You can view them there after posting, and edit them at will.
When Gnus is plugged again, you can send the messages either from the draft group with the special commands available there, or you can use the J S command in the group buffer to send all the sendable messages in the draft group.
Agent Expiry Gnus Unplugged Agent Variables