I did this by storing the data as an associative array within a database. The HTML form where the person inputs their message POSTS the data to a CGI which then inputs it into a database with the current localtime(time) used as a unique key. The date the person selected for delivery is also converted into Perl's localtime(time) format as one of the associated array elements. Cron then periodically executes another CGI which checks the database, and if the timestamp in the array is in the past, it prints the corresponding data to "|sendmail -t". Doing the localtime(time) conversion in reverse is a little tedious to work out, but it functions very reliably once you get it down.
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