/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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | [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
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