how to prevent smtp attack form inside network

Unanswered Question
Jun 4th, 2014
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i have a question about that how to limit snmp attack from inside network for prevent our ip addresses to go in blacklist
i did explore how to solve this problem
and i have found few solution

1. SMTP requests are send only permitted host(mail server)s others are drop or deny
2. SMTP requests are send through only one smtp server that locating inside network

and im finding some solution limit the connection is configured in QoS mechanism but QoS have only limit the BW and shaping.

im thinking about that is a spam. is it? 

and what device can be filter that spam?
or should i use other spam filter server or something?
i want to use cisco BRAS(my mean is ASR) or Cisco 7600 series router

how to prevent that? pls help me

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