If an ISP is going to do this as a practice, they shouldn't do it from dynamic addresses, and they should have a simple method of asking that a static IP be allowed to use port 25.
If Road Runner ever did this to me, I would be gone the next day even if I had to deal with slower speeds with DSL. This is a very bad idea, and it's a kluge of a fix for what should be done through monitoring and action only on those that cause problems. ISP's should be proactive in monitoring for zombied machines and shutting off certain ports to them when found. I know that some large ISP's do this type of thing already, but there needs to be some products that the smaller ISP's also integrate so that the blunt-force method doesn't stop companies like me from better serving business customers. If the trend keeps up, I'll probably look at ways to accept SMTP connections over port 80 as a work around, but that expense comes out of my pocket for no good reason IMO.
Matt
Burzin Sumariwalla wrote:
I was thinking of something much simpler...
Verifying that the IP appears in a MX record Verifying that Reverse DNS is set
Basically the RFC ignorant stuff...
Of course your network would have to deal with traffic before shunning it. :(
I like your idea much better.
Burzin
At 01:10 PM 12/12/2003, you wrote:
If ISPs would block outbound port 25 that would go a long way towards
keeping spam. Right now most of our spam is coming from cable and DSL IPs.
We block outbound port 25 except from our mail servers and a couple of
customers who have a legitimate reason to use another mail server. If so we
open a hole to that mail server only. It's done on a case by case basis. Is
it a pain in the ass? Most certainly but if any spam leaves our network it
will be easy as hell to track. It really burns my ass to be spammed from
these networks because the provider is either too lazy or incompetent to
block these ports.
David Daniels Administrator Starfish Internet Service [EMAIL PROTECTED] ----- Original Message ----- From: "Burzin Sumariwalla" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, December 12, 2003 1:22 PM Subject: OT: [Declude.JunkMail] Virginia Indicts Two Men On Spam Charges
> I agree with you. The statement was more general than it should have
> been. Personally I think the ISP route
> is one of the best places to begin active anti-spam measures at....
(Sorry
> ISP admins). If legislatively, ISPs
> can be forced to have customers adhere to strict RFC compliance and if
> legislatively ISPs can be forced to take
> consistent and strict measures it might force spammers into smaller and
> smaller corners.
>
> I don't represent and ISP, so maybe I'm being to optimistic.
>
>
> Burzin
>
>
>
> At 10:59 AM 12/12/2003, you wrote:
> >The only people that will hit the spammers' pocketbooks are the ISPs
getting
> >together and forcing them out of their jobs... or to get people to stop
> >buying their stuff!
>
> ------
> Burzin Sumariwalla Phone: (314) 994-9411 x291
> [EMAIL PROTECTED] Fax: (314) 997-7615
> Pager: (314) 407-3345
>
> Networking and Telecommunications Manager
> Information Technology Services
> St. Louis County Library District
> 1640 S. Lindbergh Blvd.
> St. Louis, MO 63131
>
> ---
> [This E-mail scanned for viruses by Declude Virus]
>
> ---
> [This E-mail was scanned for viruses by Declude Virus
(http://www.declude.com)]
>
> ---
> This E-mail came from the Declude.JunkMail mailing list. To
> unsubscribe, just send an E-mail to [EMAIL PROTECTED], and
> type "unsubscribe Declude.JunkMail". The archives can be found
> at http://www.mail-archive.com.
> ---
> [This E-mail scanned for viruses by Declude Virus]
>
>
--- [This E-mail scanned for viruses by Declude Virus]
---
[This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)]
--- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to [EMAIL PROTECTED], and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com. --- [This E-mail scanned for viruses by Declude Virus]
------ Burzin Sumariwalla Phone: (314) 994-9411 x291 [EMAIL PROTECTED] Fax: (314) 997-7615 Pager: (314) 407-3345
Networking and Telecommunications Manager Information Technology Services St. Louis County Library District 1640 S. Lindbergh Blvd. St. Louis, MO 63131
--- [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)]
--- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to [EMAIL PROTECTED], and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com.
