/usr/lib/aspell/ddtp.amf is in libaspell15 0.60.7~20110707-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | MODE ddtp
ASPELL >=0.60.5
DESCRIPTION mode for Debian DDTP-emails
FILTER ddtp
FILTER url
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