On 04/13/2018 11:55 PM, Jasen Betts via Exim-users wrote:
On 2018-04-13, Dmitriy Matrosov via Exim-users <exim-users@exim.org> wrote:
Hi.

Can exim unfold and decode entire multiline header (`Subject` particularly)?

Here is the first part of multiline header:

Subject:
  =?UTF-8?B?RndkOiBVUkdFTlQ6IFtOb3RpY2UgSUQgKndtVVJwRCpdINCY0YHQv9C+?=
  =?UTF-8?B?0LvRjNC30L7QstCw0L3QuNC1INC40L3RgtC10LvQu9C10LrRgtGD0LDQu9GM0L0=?=

You're going to have to tell it to disobey RFC2047 if you want that to
appear human readable, (the last part is oversize) if there's no line
break after 'Subject:' the first part is too.

main configuration: check_rfc2047_length = no
https://www.exim.org/exim-html-current/doc/html/spec_html/ch-main_configuration.html

after that change $h_subject:  shoulf have the value you want.


Thanks for answer!  I've tried `check_rfc2047_length = no` and it
indeed fixes the decoding part. I.e. now `$h_Subject` and manual
method with `reduce`

${reduce {<, ${sg {$rh_Subject:}{\\n([ \\t])}{,}}} {} {$value${rfc2047d:$item}}}

both decode entire header. But i noticed now, that encoding generates
single-line header (though, with many words). I.e. this

    headers_remove  = Subject
    headers_add = Subject: ${rfc2047:***** VIRUS ***** $h_Subject:}

results in a single line

Subject: =?UTF-8?Q?*****_VIRUS_*****_Fwd=3A_URGENT=3A_=5BNotice_ID_*wmURpD*=5D_?= =?UTF-8?Q?=D0=98=D1=81=D0=BF=D0=BE=D0=BB=D1=8C=D0=B7=D0=BE=D0=B2=D0=B0?=

Though, i may split it to multiple lines manually

headers_add = Subject: ${sg {${rfc2047:***** VIRUS ***** $h_Subject:}} { } {\n }}

but.. is putting each word on a separate line optional?

And still i have doubts about which way is better: decode header using
`h_`, then encode again, or just prepend a word to raw header without
decoding?

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