Limits

• Max Mail Size - This is maximum size limit of any mail accepted or created within the mail server. This option also overrules the equivalent group limit, capping the maximum to this value if necessary.
• Max Account Size - This is maximum size of any mail account within the mail server. This option also overrules the equivalent group limit, capping the maximum to this value if necessary.
• Max Simultaneous Connections Per IP - This controls the maximum number of simultaneous connections the mail server will allow per IP. This helps prevent Denial of Service (DOS) attacks which work by opening hundreds of connections that normally result in the mail server becoming unresponsive to other clients.
• Max Failed Login Attempts - This option affects services configured to use Anti-Hammering. This value sets the maximum allowed number of login failures. Once an IP exceeds this number within a set period of time, that IP will be blocked for a set period of time.
• Stored Failure Timeout - This option affects services configured to use Anti-Hammering. When an IP causes a login failure, this is the amount of time the failed attempt will be recorded for. Once this time as passed without any more login failures from that IP, the failed attempts count will be reset.
• Block Time - This option affects services configured to use Anti-Hammering. When an IP exceeds the ‘Max Failed Login Attempts’ value, it will be blocked for this amount of time. Any current connections or new connections will be disconnected and blocked during this period.