block hostname from authenticating Postfix

Discussion in 'HOWTO-Related Questions' started by hereinoz, Sep 9, 2014.

  1. hereinoz

    hereinoz New Member HowtoForge Supporter

    Hi All,

    I have a "Perfect Server 14.04" Ubuntu server setup with ISPConfig 3, and I have noticed many attempts to authenticate with my Postfix mail server from one particular host - onlinehome-server.com.

    The problem is that this particualr host always uses a different IP address, so fail2ban does not ban it.

    Is there any way in which I can deny all access to my mail server from onlinehome-server.com? I have been looking for a while on this, but I can't really find a definitive answer.

    I hope you can help.

    Alan
     

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