Since the topic is mysterious rejections from MTAs, I have one from UUNet. One of our business partners has UUNet for an ISP and is using UUNet for a tertiary MTA. Occasionally, mail ends up going to that MTA (quite often actually, their primary gets unresponsive from time to time and I've _never_ actually been able to reach the secondary) and gets bounced at the "MAIL FROM:", $ telnet relay.eu.mail.uu.net 25 Trying 199.171.54.122... telnet: connect to address 199.171.54.122: Connection refused Trying 199.171.54.202... telnet: connect to address 199.171.54.202: Operation timed out Trying 199.171.54.203... telnet: connect to address 199.171.54.203: Operation timed out Trying 199.171.54.245... Connected to relay.eu.mail.uu.net. Escape character is '^]'. 220 mr0.ash.ops.us.uu.net ESMTP Please see http://www.worldcom.com/global/terms/a_u_p/ for Acceptable Use Policy HELO gibraltar.globalstar.com 250 mr0.ash.ops.us.uu.net Hello gibraltar.globalstar.com [207.88.248.142], pleased to meet you MAIL FROM:<cclark@globalstar.com> 550 no QUIT 221 mr0.ash.ops.us.uu.net closing connection Connection closed by foreign host. Quite a helpful error message there, "550 no." (That's not even to mention the addresses that time out or aren't listening on 25/tcp. I see seven A records for that domain name.) Has anyone out there an idea of why UUNet does not like our domain? I would _guess_ the problem might be some weird spam filter, but AFAIK, our domain and IP space is damn clean WRT spam. The AUP link is not any help. -- Crist J. Clark crist.clark@globalstar.com Globalstar Communications (408) 933-4387