all messages the same date and time (fetchmail)

Hi all,

I use fetchmail to get my e-mail. It is delivered to Postfix (with
virus and spam filter). I also use procmail. This works great, but...
When my server is down for a few days, all new mails get the same date
and time (probably because of last header added by postfix). From the
fetchmail FAQ:

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O10. Why is the received date on all my messages the same?

This is a design choice in your MTA, not fetchmail. It's taking the
received date from the last Received header.
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Is there a solution (using postfix or procmail) to correct this
problem, because I think more people have this problem. (For example
remove the last header added by postfix).

Best regards,

Dennis