B and C. <cfmailparam> is used to attach files to an outbound message and to set SMTP headers if needed.
A, B, and D. ColdFusion has no integrated support for IMAP.
D. A period on its own line may terminate the message, causing you to lose any text that follows it.
A, C, and D. There is no getattachments. getall retrieves attachments if attachmentpath is specified.