use the time stamp from the leading line of each mail and not the
Date: field
.TP
-\fB-f\fR, \fB--do-not-discard-mails-in-the-future\fR
+\fB-f\fR, \fB--do-not-discard-mails-from-the-future\fR
keep mails with a date (more than 24h) in the future
.TP
\fB-p <db filename pattern>\fR, \fB--db-pattern <db filename pattern>\fR