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$ pwd: /usr/share/webmin/postfix/help/
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File: //usr/share/webmin/postfix/help/opt_mail_name.html
<header>Mail system name</header>

<center><tt>mail_name</tt></center>
<hr>

This parameter specifies the mail system name that is used in
<tt>Received:</tt> headers, in the SMTP greeting banner, and in bounced mail.

<hr>
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