/etc/amavis/en_US/template-problem-feedback.txt is in amavisd-new 1:2.10.1-2ubuntu1.
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# =============================================================================
# This is a template for the plain text part of a problem/feedback report,
# with either the original message included in-line, or attached,
# or the message is structured as a FEEDBACK REPORT NOTIFICATIONS format.
# See RFC 5965 - "An Extensible Format for Email Feedback Reports".
#
From: %f
Date: %d
Subject: Fw: %j
To: [? %#T |undisclosed-recipients:;|[%T|, ]]
[? %#C |#|Cc: [%C|, ]]
Message-ID: <ARF%i@%h>
#Auto-Submitted: auto-generated
This is an e-mail [:feedback_type] report for a message \
[? %a |\nreceived on %d,|received from\nIP address [:client_addr_port] on %d,]
[:wrap|78|| |Return-Path: %s]
[:wrap|78|| |From: [:header_field|From][?[:dkim|author]|| (dkim:AUTHOR)]]
[? [:header_field|Sender]|#|[:wrap|78|| |Sender: [:header_field|Sender]]]
[? %m |#|[:wrap|78|| |Message-ID: %m]]
[? %r |#|[:wrap|78|| |Resent-Message-ID: %r]]
[? %j |#|[:wrap|78|| |Subject: [:header_field|Subject|100]]]
[?[:dkim|author]|#|
A first-party DKIM or DomainKeys signature is valid, d=[:dkim|author].]
Reporting-MTA: %h
Our internal reference code for the message is %n/%i
[~[:report_format]|["^(arf|attach|dsn)$"]|["\
A complete original message is attached.
[~[:report_format]|["^arf$"]|\
For more information on the ARF format please see RFC 5965.
]"]|["\
A complete original message in its pristine form follows:
"]]#
|