Date separators in mail list
Display date separators in message lists. This would make it far easier to scroll to a period of time in the message list.
Each block of messages within a time window would have an easily seen/read header bar above it. The bars might say Sunday through Saturday for the past week (i.e. “Monday June 30“), then larger blocks of time lower in the list (divided by week or month).
Also, as you scroll, a pop-up indicator would display the current time window you are scrolling through (same text aa the last past divider). This allows fast scrolling to get into the ballpark without missing a divider. This functionality is similar to how many contacts apps behave when scrolling their list, except contact apps use alphabetical dividers & pop-ups.
These features are also used in Blackberry email apps.