[exim] blank message-id

exim-4.41

I have started to see messages arriving with blank Message-ID: headers and there
appears to be a bug in exim's handling of them.

exim is adding its own Message-ID: header as one would expect, but it is not
removing the original blank one, so we end up with two Message-ID: headers, which
results in an invalid header.

Is there a quick fix I can put in my configuration or do I need a fix for the code?

Phil.
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Phil Chambers (postmaster@???)
University of Exeter