John,

Dial-up ISP's, especially smaller ones, are very unlikely to be targeted by spammers due to the dynamic nature of the IP space.  There one minute, gone the next...and the bandwidth sucks.  Almost all viruses don't use mail servers to spread, so SMTP AUTH won't stop them either, but blocking port 25 would along with a host of other techniques which are less restrictive on legitimate use such as monitoring/automatic shuttoff of accounts.

I looked up Greg's IP space in SenderBase and there are absolutely no signs of dial-up IP's leaking spam or viruses, and only his MX servers have any SpamCop hits, and these might be primarily related to his gateway accepting all locally addressed mail which then might get bounced by his primary IMail server for being unaddressable (I'm guessing here based on his lone abuse newsgroup listing).  Even I have this problem currently due to software limitations, and it's going to cost me a good deal of money and time to create a work around so that I can do envelope rejection on the gateways.

Overall I would say he's about as clean as they come and there's no cause for alarm.

Matt



John Tolmachoff (Lists) wrote:
Why are you so much different than other ISPs that you can not force
authentication?
      
Try to imagine having to contact thousands of subscribers and walk them
through changing their settings. Even if we only took a minute to help
    
each
  
subscriber (and I can guarantee you a minute isn't even close to the time
    
it
  
would take to help our subscribers) were looking at 5+ 24 hour days doing
nothing but that.
    

I, as well as every one else, understands that. What you need to do is
formulate a plan to implement over say a month. Start with broadcast
announcements and such. Then, start migrating your users in blocks. Yes, it
would be a lot of work. But the results are worth it.

  
If you really think about it, if you are not forcing
authentication, you are ripe to allowing spamming and run-away viruses.
      
Why? Could you please explain that logic to me as I don't understand it.
    

I assume you are relaying for addresses in Imail SMTP. (If you are relaying
for users or domains, you have no idea about relay settings.) That means
that any one using one of those addresses can send out millions of spam
e-mails through your server and there is nothing you can do about it. This
includes users that may have viruses on their computers, and are now acting
as robots.

John Tolmachoff
Engineer/Consultant/Owner
eServices For You


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