RE: [exim] Regexp for catching "prefixed" Message-ID: fields…

I am sorry, but does Exim prefix the headers with '\n' when generating
$message_headers var?

I mean

"\nHeader1: Value1\nHeader2: Value2\n"

or

"Header1: Value1\nHeader2: Value2\n"

???

> You could use a regex to check for the presence of \n[^:]*Message-ID:
in
> $message_headers.