Directory:~$ /usr/lib/firewalld/services/

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<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>Mail (SMTP over SSL)</short>
  <description>This option allows incoming SMTPs mail delivery. If
you need to allow remote hosts to connect directly to your machine to
deliver mail in a secure way, enable this option. You do not need to enable
this if you collect your mail from your ISP's server by POP3 or IMAP,
or if you use a tool such as fetchmail. Note that an improperly configured
SMTP server can allow remote machines to use your server to send
spam.</description>
  <port protocol="tcp" port="465"/>
</service>