Use an interface that is split into panes.
This interface is more user friendly and attractive, but requires a web browser that supports 'frames' and 'cookies'.
Use a single-pane interface.
For old or 'thin' web browsers. More cumbersome to use.
Use a totally text-based interface.
Designed for very old or very 'thin' web browsers, or for extremely slow network connections. Very ugly, but very practical. Designed to work anywhere.
Don't cache output.
Check here to set MailMan to mark all output pages as expired so that they will not be cached, for increased security and privacy. (Some web browsers may not honor page expiration directives.)