[EXIM] Really long Received: lines

Just got a spam message, that had its true origination successfully
obscured - first Received: line was very long and sendmail that handled the
message failed to put sender's IP in it. Long string said something like
"this.message.true.origination.obscured.by.mailgod.software..." and so on. I
sending host gave this string in HELO.

So two questions:

1. What will exim do with such a long HELO string?

2. Is it possible to write a system filter that will fail messages with
incorrect Received: headers?

                avk

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Brave new world...

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