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Over the past 2 - 3 months I occasionally get emails rejected with AUP#CXSNDR. I have contacted Cox Tech Support and they have not been helpful. Rep on my call today said the email is being routed through an international server due to an attachment. Sequence is as follows: I send email with picture to one recipient; they respond; I respond back and it is rejected. No spam, not groups, etc. The email I responded to was only 12 KB per my Outlook inbox and there were no attachments (the picture in my original email was not attached in the response sent to me). I use a Cox.net email ID which I have had for about 30 years. I send and reply to 20 - 40 emails each day. This is sporadic and I can not detect a pattern. It is also new - I did not have this problem until the last 2 - 3 months.
I have looked up the AUP code which says my email failed authentication checks against my sending domain's SPF, DomainKeys, or DKIM policy. The intended recipients of my rejected emails are people I frequently correspond with (and normally have no problems). Does anyone have any ideas how I (or Cox) can fix this? I'd love to send a rejected email to Cox and let them look into it but don't think it would go through (and I don't know who to send it to).
Thanks for your response. I don't see anything on your link that helps for CXSNDR. I quoted what it says in my original post above. I have an ethernet connection to my home network. I continue to receive/send several dozen emails each day without problems. The above error is intermittent. It is possible that problem is only applicable to certain email addresses, I have not made a log. I read the "contacting cox for assistance" that you referenced and that appears to be for corporate accounts, e.g., info is requested on "outgoing email servers". The most recent problem occurred when responding to an email ID that I have corresponded with for months. I still think something has changed at Cox. Is it possible to email a rejected email to some group at Cox for your review? Multiple calls to Cox tech support have not been helpful (although the reps were very courteous). You mentioned DNS server - I am not aware of one for my home network. If all networks have one, please advise how I can check to see if it is set to dynamic.