Thanks for your answer!

On Mon, Aug 23, 2010 at 3:34 AM, Ansgar Wiechers <li...@planetcobalt.net> wrote:
> On 2010-08-22 Jose Ildefonso Camargo Tolosa wrote:
>> I got a curiosity, I have noted that the Date header the mail takes
>> comes from the client computer, so, if my computer have a wrong date,
>> my mail will go out with a wrong date too.
>> I know the server will put its own timestamp when it process the
>> message, but the destination mail client will use the Date header to
>> order messages, and thus, if someone's computer has a date of now-3
>> days, there is a risk that the mail he/she sends is overseen by the
>> receiver.
>> I also know that there should be a policy to keep all of the company's
>> PCs clock synchronized to a central server: but that's not the case,
>> and there are a few PCs with failing BIOS batteries (which shouldn't
>> happen).
> NTP should take care of both issues.

Yes, but this is not an option when you don't have control over all
the PCs.  I know it is the correct thing to do: just have all the
computers synchronize their clock (I already said so, I just omited
the technology, as a matter of fact, there is an NTP server, and I use
it for all the servers).

>> I have to ask: is there a way of making postfix rewrite Date header to
>> server's time for authenticated mail? (or at list for a range of IPs),
>> off course, a general header rewrite would not be good, because that
>> would overwrite header for mail coming from the Internet (that would
>> be really bad).  I took a quick look at the docs, and found nothing on
>> this matter, nevertheless, if someone can point me to a doc where this
>> is explained, that will be enough for me.
>> What do you think on this?
> Fix the problem rather than the symptom.

Yes, I know, but it is not always an option.  As I said: you don't
always have control over the people's computer (say, the case of an
ISP, where you have lots of clients, but you don't touch a client's
computer, it is not the case, but I can think of that as an example).

Still, I want to know if is there a way of selectively rewriting
headers, actually, MS Exchange does this: it has an option to use
server's time for outgoing mail from local users (no: I will not use

Once again, thanks for taking the time to answer me!



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