HEX
Server: nginx/1.16.1
System: Linux ecs-04358622 4.19.90-2107.6.0.0100.oe1.bclinux.x86_64 #1 SMP Wed Dec 1 19:59:44 CST 2021 x86_64
User: nginx (994)
PHP: 8.0.0
Disabled: NONE
$ pwd: /lib/firewalld/services/
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File: //lib/firewalld/services/smtp-submission.xml
<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>Mail (SMTP-Submission)</short>
  <description>SMTP-Submission allows remote users to submit mail over port 587.</description>
  <port protocol="tcp" port="587"/>
</service>
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