One of my e-mail addresses is suddenly (the last few days) unable to receive e-mail. When I send to it, I get this bounce message: Original-Recipient: RFC822;<XXXXXX@charter.net> Final-Recipient: RFC822; <XXXXXX@charter.net> Action: failed Status: 5.3.0 Remote-MTA: dns; f.mx.mail.yahoo.com (18.104.22.168) Diagnostic-Code: smtp; 554 delivery error: dd This user doesn't have a yahoo.com account (XXXXXX@yahoo.com)  - mta287.mail.mud.yahoo.com X-Actual-Recipient: RFC822; <XXXXXX@yahoo.com> The charter.net address is the one I'm sending to. The yahoo address is a mystery - never heard of it. If I were on a PC, this would look like a virus. (BTW, it's a MBP running 10.5.2) My ISP (Charter) seems to be clueless. They tell me my IP is blocked, and I can't send or receive - however, I can SEND just fine. They told me to reset my password, which I did - no luck. They keep referring me to someone else, where I either get cut off mid-conversation or just get the same automatic advice. Any help would be GREATLY appreciated. Thanks in advance.