Cox SMTP Access Blocked for Vacation Home IP Address
Cox is the ISP at home in Louisiana. On Cox WiFi there, I am successful in using either Microsoft Outlook on my Windows 10 laptop or Mail on my iOS 15.7 iPhone (with cellular data either on or off) to receive and send my Cox e-mail. I use Cox’s recommended settings … Incoming: pop.cox.net / port 995 Outgoing: smtp.cox.net / port 465 / SSL My Problem ... I also am a customer of Suddenlink (now Optimum) as my ISP at a vacation home in Arkansas and have a Suddenlink-provided modem/router. My incoming Cox e-mail works fine through Suddenlink WiFi, however I cannot successfully send Cox e-mail through WiFi from Outlook, nor from my iPhone if cellular data is turned off. This failure occurs from two different devices and two different software platforms, and only occurs when I am using Suddenlink WiFi. Here is the error message from Outlook I get when trying to send outgoing e-mail … “Task '... Sending' reported error (0x800CCC6F): 'Your outgoing (SMTP) e-mail server has reported an internal error. If you continue to receive this message, contact your server administrator or Internet service provider (ISP). The server responded: 554 cxr-obgw-5003a.stratus.cloudmark.com cmsmtp[my IP address appears here] blocked. Refer to Error Codes section at www.cox.com/.../email-error-codes.html for more information. AUP#CXDNS” Why is Cox SMTP blocking my IP address? Was the prior user of this Suddenlink-provided modem/router on a blacklist? How can I remedy this? Who can remedy this? Prior chats with Cox have led nowhere! Any advice?
