nanog mailing list archives
Re: Do you obfuscate email headers when reporting spam issues to clients?
From: William Herrin <bill () herrin us>
Date: Wed, 6 Nov 2013 16:45:31 -0500
On Wed, Nov 6, 2013 at 1:30 PM, Landon <landonstewart () gmail com> wrote:
We (iWeb AS32613) are currently making great strides in getting out from under the volume of reports received and getting on top of things.
Incidentally, I'd suggest that an ounce of prevention is worth a pound of cure. Simply block outbound tcp port 25 for new hosting customers on a "tell me if you want it open" basis. Don't make 'em jump through hoops: if they want it open, open it. But for everybody who doesn't tell you they want it open, keep it closed. Then analyze your data traffic for a month or two and close the port on any old customers that haven't sent any email. By doing so, you restrict the potential source of the problem to just those customers who intentionally generate email from their hosted service. Non-email using customers who get hit with worms and spambots will bounce off your shield. Also, you force spammers to bring themselves to your notice before they can send any mail -- something they're disinclined to do. Regards, Bill Herrin -- William D. Herrin ................ herrin () dirtside com bill () herrin us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004
Current thread:
- Do you obfuscate email headers when reporting spam issues to clients? Landon (Nov 06)
- Re: Do you obfuscate email headers when reporting spam issues to clients? William Herrin (Nov 06)
- Re: Do you obfuscate email headers when reporting spam issues to clients? William Herrin (Nov 06)
- Re: Do you obfuscate email headers when reporting spam issues to clients? Doug Clements (Nov 06)
- Re: Do you obfuscate email headers when reporting spam issues to clients? Jimmy Hess (Nov 06)
- Re: Do you obfuscate email headers when reporting spam issues to clients? Jon Lewis (Nov 06)
- Re: Do you obfuscate email headers when reporting spam issues to clients? Rich Kulawiec (Nov 07)
- Re: Do you obfuscate email headers when reporting spam issues to clients? Blake Dunlap (Nov 07)
- Re: Do you obfuscate email headers when reporting spam issues to clients? Nonaht Leyte (Nov 07)
- Re: Do you obfuscate email headers when reporting spam issues to clients? Landon (Nov 12)
- Re: Do you obfuscate email headers when reporting spam issues to clients? Rich Kulawiec (Nov 07)
- Re: Do you obfuscate email headers when reporting spam issues to clients? William Herrin (Nov 07)
- <Possible follow-ups>
- Re: Do you obfuscate email headers when reporting spam issues to clients? Anne P. Mitchell, Esq. (Nov 06)
- Re: Do you obfuscate email headers when reporting spam issues to clients? William Herrin (Nov 06)