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XCCDF
Guide to the Secure Configuration of Red Hat Enterprise Linux 7
Services
Mail Server Software
Configure Operating System to Protect Mail Server
Configure Postfix if Necessary
Configure SMTP Greeting Banner
Configure SMTP Greeting Banner
An XCCDF Rule
Details
Profiles
Prose
Configure SMTP Greeting Banner
Low Severity
Edit
/etc/postfix/main.cf
, and add or correct the following line, substituting some other wording for the banner information if you prefer:
smtpd_banner = $myhostname ESMTP