This file is indexed.

/etc/gufw/app_profiles/mailserver.ufw_app is in gufw 16.04.1-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[pop3]
title=POP3
description=Post Office Protocol
ports=110/tcp
categories=Network;Services;
reference=[http://en.wikipedia.org/wiki/Pop3 - Wikipedia]

[POP3S]
title=POP3S
description=Secure mail server
categories=Network;Services;
ports=995/tcp

[imap]
title=IMAP
description=Internet Message Access Protocol
ports=143/tcp
categories=Network;Services;
reference=[http://en.wikipedia.org/wiki/Imap - Wikipedia]

[IMAPS]
title=IMAPS
description=Secure mail server
categories=Network;Services;
ports=993/tcp

[smtp]
title=SMTP
description=Simple Mail Transfer Protocol
ports=25/tcp
categories=Network;Services;
reference=[http://en.wikipedia.org/wiki/Smtp - Wikipedia]