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Old 19th November 2012
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jggimi jggimi is offline
More noise than signal
Join Date: May 2008
Location: USA
Posts: 6,423

On my personal network, I manage a limited amount of outbound traffic. Other than just traffic shaping outbound traffic by bandwidth, the only outbound traffic I govern is Email. I don't prevent malware transmission outbound, I merely eliminate spambots:
I block outbound SMTP traffic except for known, permitted MTAs, operated by my ISP or by other contracted Email service providers, such as DynDNS's I route outbound traffic through a local MTA. Initially I did so with the intent of filtering outbound Emails with SpamAssassin, but later dropped that idea without implementing it. I did not want to deal with the delays and management complexities of false positives. Now I merely monitor /var/log/maillog for outbound traffic loads. The monitoring tool I use is grep(1) | less(1).

The only time I had a problem with excessive traffic it was due to repetitive Emails caused by a full partition, not any sort of comprised system.

Last edited by jggimi; 19th November 2012 at 08:42 PM. Reason: typo, clarity
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