in order to receive logs and alerts by e-mail, you must provide your e-mail information in the e-mail subheading:

figure 6-7: e-mail menu
1 turn e-mail notification on check this box if you wish to receive e-mail logs and alerts from the firewall.
2 your outgoing mail server
enter the name or ip address of your isp’s outgoing (smtp) mail server (such as mail.myisp.com). you may be able to find this information in the configuration menu of your e-mail program. if you leave this box blank, log and alert messages will not be sent via e-mail.
3 send to this e-mail address
enter the e-mail address to which logs and alerts are sent. this e-mail address will also be used as the from address. if you leave this box blank, log and alert messages will not be sent via e-mail.
you can specify that logs are automatically sent to the specified e-mail address with these options:
1 send alert immediately
check this box if you would like immediate notification of a significant security event, such as a known attack, port scan, or attempted access to a blocked site.
2 send logs according to this schedule
specifies how often to send the logs: hourly, daily, weekly, or when full.
1 day for sending log
specifies which day of the week to send the log. relevant when the log is sent weekly or daily.
2 time for sending log
specifies the time of day to send the log. relevant when the log is sent daily or weekly.
if the weekly, daily or hourly option is selected and the log fills up before the specified period, the log is automatically e-mailed to the specified e-mail address. after the log is sent, the log is cleared from the firewall’s memory. if the firewall cannot e-mail the log file, the log buffer may fill up. in this case, the firewall overwrites the log and discards its contents.