On Mon, Jan 06, 2020 at 09:47:24PM +0100, Jos Chrispijn wrote:
> Best check your header_checks configuration. It should look like this:
>
> /^Date: .* [0-1][0-9][0-9][0-9]/ REJECT Your email has a date from the
> past. Fix your system clock and try again.
> /^Date: .* 200[0-9]/ REJECT Your email has a date from the
> past. Fix your system clock and try again.
> /^Date: .* 201[0-9]/ REJECT Your email has a date from the
> past. Fix your system clock and try again.
> /^Date: .* 2020/ DUNNO
> /^Date: .* 20[2-9][1-9]/ REJECT Your email has a date in the
> future. Fix your system clock and try again.
> /^Date: .* 2[1-9][0-9][0-9]/ REJECT Your email has a date in the
> future. Fix your system clock and try again.
> /^Date: .* [3-9][0-9][0-9][0-9]/ REJECT Your email has a date in the
> future. Fix your system clock and try again.
>
> Hope this helps!
Best to not use regular expressions for this at all. If you must
perform this sort of check, do it in a pre-queue proxy filter or milter,
using a proper date parser and by comparing to the current time.
For a another take on misuse of regular expressions, see:
https://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/1732454#1732454
--
Viktor.
