/usr/share/applications/mailnag.desktop is in mailnag 1.2.1-1.
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 9 10 11 | [Desktop Entry]
Name=Mailnag
Comment=An extensible mail notification daemon
Comment[de]=Ein erweiterbarer Mail-Benachrichtigungs-Dämon
Keywords=mail;notify;notification;
Exec=/usr/bin/mailnag --quiet
Icon=mailnag
Type=Application
NoDisplay=true
X-GNOME-Autostart-enabled=true
X-GNOME-UsesNotifications=true
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