North American Network Operators Group
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Re: Port 25 filters - how many here deploy them bidirectionally?

  • From: Bob Martin
  • Date: Tue Jan 25 14:35:06 2005

After this post, we did some real digging.

The timing of the ever lower levels of spew from our dial up pool coincides with the blocking of the MS NetBios ports, and the implementation of full outbound email scanning (both AV and spam). By full scanning, I mean we treat all email as untrusted, regardles of where it originates.

We've evidently made it harder to turn the boxen into zombies, and time and entropy have started to clean up the ones that where there.

b

Bob Martin wrote:

We really don't know what to make of it.

Either the spammers have modified their code so that they don't waste their time trying to spew from blocked machines, or we've been very lucky of late.

I hope it's the former, but suspect it's the latter.

Bob

Subhi S Hashwa wrote:

Sunday, January 9, 2005, 4:17:27 PM, Bob Martin wrote:



This may or may not be related, but we have seen a sharp decline in spam
attempts from our dial up pool since Sept 2004.


Intersting. with the spam on the increase, do you think spammers are
'ignoring' your customer base? or is there other factors involved ?