It's common for the bigger ISPs (and probably the small ones, but they're more intelligent) to block whole domains. They do this when the level of spam from a domain reaches some % of traffic. Earthlink has done it to Verizon, AOL to the ARRL, etc. It usually takes a bunch of complaints, resulting in calls between ISPs to unblock. It's probably automatic, and the smaller guys (I know a few) are quite paranoid about ever getting their traffic to that % (I think it might be as low as 5% in some cases). While a call from a Verizon bigwig gets through quickly at AOL let's say, the little ISP in Backwater, Miss., isn't going to have a good time trying.... I have also experienced this myself between two of my own accounts at Verizon and another ISP. Second level tech support and I tried all sorts of tracing, then when he heard what ISP I was sending to (a big name), there was a pause, mumbles to someone, then he said I might have better success sending to another domain for a while... Anywhere else worked, except to that domain for a while, and I couldn't get him past a canned, sanitized statement after that. Alan B. Pearce wrote: > > OK, the last yahoo bounce I had stated "Remote host said: 550 5.7.1 > ... Rejected: 66.94.237.52 listed at > sbl-xbl.spamhaus.org [RCPT_TO] > > I use email as well, and it all originates from the same IP as this email, > i.e. 130.246.xx.yy, so Yahoo do it on the email address. > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist