This file is indexed.

/etc/ufw/applications.d/ufw-mailserver is in ufw 0.31.1-2.

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=Mail server (POP3)
description=Mail server (POP3)
ports=110/tcp

[POP3S]
title=Secure mail server (POP3S)
description=Secure mail server (POP3S)
ports=995/tcp

[IMAP]
title=Mail server (IMAP)
description=Mail server (IMAP)
ports=143/tcp

[IMAPS]
title=Secure mail server (IMAPS)
description=Secure mail server (IMAPS)
ports=993/tcp

[SMTP]
title=Mail server (SMTP)
description=Mail server (SMTP)
ports=25/tcp

[Mail submission]
title=Mail server (Submission)
description=Mail server (Submission)
ports=587/tcp