- Use RFC 2047 encoded-word for non-ASCII attachment filenames instead of
RFC 2231 filename* segments, which Coremail Web fails to display.
- Build multipart messages with MIMEMultipart when attachments are present
to keep address headers and attachment filenames Coremail-compatible.
- Add --attach support to reply and forward commands.
- Quote the original message body in reply drafts for proper threading.