How can I download attachments from a MailEnable email via the API?

After viewing an email and obtaining the `MessageID` and `Filename` from the XML response, send a request to `/MEWebMail/Mondo/lang/sys/Forms/MAI/GetAttachment.aspx` with `Folder`, `MessageID`, and `Filename` parameters. The attachment can be saved as text or binary. For a full implementation, see the MailEnable Development Guide.