James Marhaus wrote:
Yes, it was an adaptation of a recipe for testing whether a message was
sent outside local business hours (before 8:00 am or after 4:00 pm).
I've been using this as a "spammishness" criterion, since most of the
non-greenlisted mail received outside these hours is spam. (legitimate
new business contacts usually send email during normal hours)
Doesn't your server provide a From_ line with a timestamp? If it
doesn't, you can call procmail with the -f- option (yes, hyphenfhyphen)
to make procmail generate one. Then the time of receipt will be in the
postmark line, and you don't need to go through this stuff.
:0
* ^^From .+ (0[0-7]|1[6-9]|2.):
do_something
I regularly use that method to write recipes that turn on and off at
specific dates and times. Alternatively, you can use the timestamp from
the topmost Received: header, like this:
:0
* 1^0 ^Received:.+ \/[012][0-9]:
* MATCH ?? 0[0-7]|1[6-9]|^^2
do_something
But you might want to consider widening the definition of business hours
to include more time zones and businesses that stay open until 5 PM.
Excellent, I will take the union of this recipe with David T.'s and post
a procmail-only "business hours" recipe if anyone is curious.
Since your lower bound and your variable can never be negative, you can
safely subtract them with a simple minus sign as Dallman originally wrote.
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