[exim-dev] [Bug 3078] New: DKIM: signing failed: LONG_LINE

https://bugs.exim.org/show_bug.cgi?id=3078

            Bug ID: 3078
           Summary: DKIM: signing failed: LONG_LINE
           Product: Exim
           Version: 4.97
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: bug
          Priority: medium
         Component: DKIM
          Assignee: tom@???
          Reporter: daw.dudzinski@???
                CC: exim-dev@???

In logs, some emails are sent without signing with warning: DKIM: Signing
failed: LONG_LINE.

My config:

remote_smtp:
driver = smtp
tls_verify_cert_hostnames = !*
tls_try_verify_hosts = !*
message_linelength_limit = 800000 #value for test
dkim_canon = relaxed
dkim_domain = my_domain
dkim_private_key = /etc/exim/certs/dkim.private
dkim_selector = teststring

In transport_filter I tried to add a command to executing script to fold line,
but it doesn't work for me. I get error: unable to execute command

transport_filter = '${if
>{$max_received_linelength}{998}{/path/to/script_line_folding 998}{}}'

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