/etc/amavis/en_US/charset is in amavisd-new 1:2.6.5-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # This is charset for en_US messages.
# If you are creating new messages, use 'iconv -l' to get possible encodings.
ascii # or iso-8859-1
ignored lines after first one
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