Strange it would do that ONLY when sending mail to customer service addresses. I honestly can't imagine this could be the whole story on your problem. It would imply that Cox is blocking outgoing mail to particular userids.
Are you actually connected to a Cox internet connection and trying to deliver it through the proper Cox smtp server?? Does your ISP require or support SMTP authentication and have you enabled it in Eudora? Assuming you aren't making a typo in the 'To:' field of you mail client, often times a smtp server will reject mail with a 553 code when the person/host trying to send the mail is using a different internet provider or if the from/return address on the email is not a valid address for that ISP. Sometimes enabling smtp authentication in your mail client is all that needs to be done. -Tharin O. Winterlight <[EMAIL PROTECTED]> wrote: Why does Cox block customer service email? They have been doing this a long time. I can't reply with Eudora to anything from any tech support, or customer service, or anything like that. It gets blocked by COX SMTP server. I end up having to send from a web interface. It doesn't matter if I am sending to a big company like Logitech or a email vendor ,..... I have the same Can't send to ''. The server gives this reason: '553 Sorry, that domain isn't in my list of allowed rcpthosts.'. error in Eudora.