Tim Jackson <lists@???> wrote:
[...]
> Now, the method suggested in the spec (using warn = Subject: whatever)
> is OK, but results in two Subject headers which is a bit nasty. So I
> started thinking about an improved way, and stumbled across FAQ Q0905
> (http://www.exim.org/exim-html-4.50/doc/html/FAQ_9.html#TOC288), which
> says:
> "You can only do this in a round about way, using filter commands like
> this:
> headers add "New-Subject: SPAM: $h_subject:"
> headers remove subject
> neaders add "Subject: $h_new-subject:"
> headers remove new-subject
> This trick works only in system filters, where the commands are obeyed
> in order, and affect the master list of headers that apply to the whole
> message. You cannot do this with the headers_add and headers_remove
> options on drivers."
[...]
> IN DATA ACL (normal kind of stuff):
> warn message = X-Spam-Flag: YES
> spam = someuser
> IN APPROPRIATE ROUTERn:
> headers_remove = Subject
> headers_add = ${if {eq{$h_X-Spam-Flag:}{YES}}
> {Subject: *****SPAM***** $h_Subject:}
> {Subject: $h_Subject:}
> }
I guess this will fail miserably if the message is routed more than
once. - This /might/ not be a issue for local delivery but afaict remote
messages are frequently routed multiple times, if the remote host is
temporarily down.
cu andreas
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