Regexps that accept exactly one the year in the Date: field will
bounce some email around the end of the year, because year changes
don't happen globally at the same time, and email may be in transit
for up to a few days.
By the end of 2019 the patterns should be:
/^Date: .* 2019/ DUNNO
/^Date: .* 2020/ DUNNO
/^Date: .* [0-9][0-9][0-9][0-9]/ REJECT bad year in date
And by the end of 2020:
/^Date: .* 2020/ DUNNO
/^Date: .* 2021/ DUNNO
/^Date: .* [0-9][0-9][0-9][0-9]/ REJECT bad year in date
This could be automated by a cronjob.
Wietse
