https://bugs.exim.org/show_bug.cgi?id=2843
Bug ID: 2843
Summary: wishlist for method to correctly create valid headers
like SomeHeader:${format_header: .....}
Product: Exim
Version: 4.95
Hardware: All
OS: All
Status: NEW
Severity: wishlist
Priority: medium
Component: String expansion
Assignee: unallocated@???
Reporter: arekm@???
CC: exim-dev@???
This is feature request about adding feature (string expansion) for creating
proper headers based on other data. That will handle correctly folding, new
lines, length etc.
Use case, probably there are other, too:
There is bounce_message_file feature in exim. It allows generating own bounce
messages. Unfortunately this file needs to be perfect since exim doesn't do any
validation or normalization of data there.
So that file contains:
Subject: Mail delivery failed${if eq{$sender_address}{$bounce_recipient}{:
returning message to sender}}
now we want to add original subject inside this one
Subject: Mail delivery failed${if eq{$sender_address}{$bounce_recipient}{:
returning message to sender}}: $h_subject:
That won't get correct results since original subject can be long, can be
folded etc.
So some:
Subject:${format_header:Mail delivery failed${if
eq{$sender_address}{$bounce_recipient}{: returning message to sender}}:
$h_subject:
}
would be nice.
ps. right now using
Subject: Mail delivery failed${if eq{$sender_address}{$bounce_recipient}{:
returning message to sender}}: ${sg{$h_subject:}{^(.\{50\})..*\\s\$}{\$1
[...]}}
so truncating (since it's hard to do folding here correctly with what exim
currently offers) which is not optimal but (I hope) correct and safe enough.
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