/usr/share/kde4/apps/kconf_update/mailtransports.upd is in libmailtransport4 4:4.8.2-0ubuntu2.
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 9 10 11 | # Migrate kmail's transport settings
Id=initial-kmail-migration
File=kmailrc,mailtransports
ScriptArguments=kmail
Script=migrate-transports.pl,perl
# Migrate knode's mailserver settings
Id=initial-knode-migration
File=knoderc,mailtransports
ScriptArguments=knode
Script=migrate-transports.pl,perl
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