Hence the need for a resorce to keep track of rogue customers :) anyway, cases of blocking port 25 are not limited to our telcos/ISPs. Its a common practice as a way of limiting spam send from their networks. http://www.postcastserver.com/help/Port_25_Blocking.aspx -----Original Message----- From: Odhiambo ワシントン <odhiambo@gmail.com> Reply-to: Skunkworks forum <skunkworks@lists.my.co.ke> To: Skunkworks forum <skunkworks@lists.my.co.ke> Subject: Re: [Skunkworks] Good $afcom net connection Date: Mon, 4 May 2009 16:48:22 +0300 On Mon, May 4, 2009 at 4:40 PM, Alex Nderitu <nderitualex@gmail.com> wrote: Wash, What if I decide to setup my own SMTP server and I am a GPRS/EDGE/3G customer and start relaying (spamming) directly to the internet via DNS? A funny torjan can also do this. Then Safaricom comes for your neck! I am sure they can trace the spamming IP address to the SIM Card and get you....they can block it. Even if you are using a prepaid SIM card.....if I was their sysadmin, I can play this game with you till you are broke:-) It's pretty easy to control any spamming server though...several tricks at throttling your connection and even "suffocating" your server to an extent it runs out of resources - yes, the spamming server - you pump into the SMTP engine mail that does not go out, thereby DDoS-ing your own server. Get it? But fundamentally, you are right. -- Best regards, Odhiambo WASHINGTON, Nairobi,KE +254733744121/+254722743223 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ "Clothes make the man. Naked people have little or no influence on society." -- Mark Twain _______________________________________________ Skunkworks mailing list Skunkworks@lists.my.co.ke http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks Other services @ http://my.co.ke Other lists ------------- Skunkworks announce: http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks-announce Science - http://lists.my.co.ke/cgi-bin/mailman/listinfo/science kazi - http://lists.my.co.ke/cgi-bin/mailman/admin/kazi/general -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.