This file is indexed.

/usr/share/kde4/services/smtp.protocol is in kdepimlibs-kio-plugins 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.

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[Protocol]
exec=kio_smtp
protocol=smtp
Capabilities=SASL
input=none
output=filesystem
listing=Name,Type,Size
reading=false
writing=true
deleting=false
source=true
makedir=false
linking=false
moving=false
X-DocPath=kioslave/smtp/index.html
Icon=mail-folder-outbox