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http://bugs.exim.org/show_bug.cgi?id=1291
Summary: System filter cannot modify headers after first delivery
Product: Exim
Version: 4.80
Platform: Other
OS/Version: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Filters
AssignedTo: nigel@???
ReportedBy: cbay@???
CC: exim-dev@???
I want to have a system filter that modify headers after the first delivery.
According to the documentation, that should be possible:
"For this reason, it is usual to make the headers command conditional on
first_delivery so that the set of header lines is not modified more than once."
As I understand it, although most users only want to modify headers on the
first delivery, they specifically have to use "if first_delivery". If you don't
use "first_delivery", your directives should apply on each delivery.
However, my tests suggest that it doesn't work. I have a very simple test
filter:
headers add "X-Foo: bar"
defer
(the defer is only to make testing easier, I get the same results without it)
It adds the header just fine on the first delivery, but fails to do so on
retries. It's not a matter of duplicate headers: even if I temporarily rename
the header name and force a delivery with exim -M, it doesn't do anything, and
the spool header file remains untouched. Removing headers doesn't work either.
Testing the filter with -bF prints:
Headers add "X-Foo: bar"
Defer text ""
Filtering ended by "defer".
2012-06-20 12:05:08 Delivery deferred by system filter
Running exim -d+all -M prints nothing unusual:
12:08:53 1862816 Filter: start of processing
12:08:53 1862816 Filter: defer ""
12:08:53 1862816 Filtering ended by "defer".
12:08:53 1862816 Filter: end of processing
12:08:53 1862816 system filter returned 3
12:08:53 1862816 LOG: MAIN
12:08:53 1862816 Delivery deferred by system filter
I tested initially on 4.77. Same results with 4.80, freshly compiled, with an
almost empty config file (not much besides 'system_filter').
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