On Tue, 7 Oct 1997, Tom wrote:
> This isn't quite right. You want:
>
> if ${def:$h_x-advertisement} then
> seen finish
> endif
No!
At least not with the currently released Exim 1.73. The "def" operator
works only on _variables_, not on headers. Perhaps I should have used
some different syntax to make the distinction between the two clear, but
I didn't want to use up more than one metacharacter for expansions.
This deficiency had already been brought to my attention, and in fact
only yesterday I implemented an extension for the next release which
makes "def" work for headers too. However, the correct syntax will be
if ${def:$h_x-advertisement:} then
because '}' is not a special character in RFC822 addresses, and it is
perfectly legal for it to appear as part of a header name. The only
characters that terminate a header name are : and white space. (RFC 822
was far too liberal in this kind of thing, IMO, but we have to live with
it.)
--
Philip Hazel University Computing Service,
ph10@??? New Museums Site, Cambridge CB2 3QG,
P.Hazel@??? England. Phone: +44 1223 334714
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