Rules for image overlays, paths, tints, etc.

User background preferences .

Animated scrolling text.

Movies.

Multiple mailboxes in the same window.

Contextual menus for all sorts of things in windows and dock.

Preferences to determine what appears in text under image or tooltip.

Make the label area size user settable and have the labels wrap.

Drag and drop images to set new image for correspondent.

Preference to invoke arbitrary program on mail receipt.

Mechanism for random or rotating images for a given correspondent.

Highlight (bink? animate?) new mail images.

Floating windows.

miniwindow message count.

miniwindow icon show last mail.

Update mail slot icon with account being checked.

Control drag to permit aspect ratio distortion.

Allow multiple selectections in account table for enable, delete, and whatever else makes sense.

Allow account table entries to be reordered by dragging.

Add arbitrary sub level domain tokens for search paths. I.e., TLD, DL1, DL2, DL3, ...