1#@!#!123s

: / proc / self / root / usr / lib / firewalld / services /

Filename : smtp-submission.xml

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<?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>