Version:            (using KDE KDE 3.1)
Installed from:    Solaris Packages

kmail should be able to track email responses for selected emails as follows:

1. During the step of creating new emails (or responding to emails), the user can select an option to activate response tracking and enter or select a certain time frame (a certain number of minutes, hours, days, weeks, or months).

2. When sending such emails, the sender, the subject, and the desired latest response date and time, calculated from the current time and the time frame entered or selected, is stored on disk in an appropriate ASCII format, in a list that may be called an email response tracking list ("tracking list").

3. All incoming emails are now scanned against the email response tracking list. If an incoming email matches the following criteria:
a) sender of incoming mail is the same as an entry in the tracking list, AND
b) subject of that entry in the tracking list is substring of the subject of the incoming mail (a string compare using "Re: " and subject will not work because there are also other methods of marking an email subject as a response, like "WG: "), AND
c) the arrival date and time is less than the date/time specified in that entry,
then that entry will be deleted. Additionally, if desired (user configurable), the user will be notified that the response tracking entry has been deleted. For a notification method, see next chapter.

4. Additionally, regularly or when connecting to email servers (user configurable), for all entries in the tracking list for which the destination date and time are smaller than the current date and time, the user is notified via a user-configurable method like xmessage, mailx, or any other convenient method. The user may also specify if such a notification may occur only once or more than once. Another possible method would be to resend the email automatically, after the whole response tracking system has been proven to be reliable.

Hope I did not miss an important topic ;-)