Every email I send bounces immediately and tells me it has an invalid address, even when I try to reply to mails I just got. Can anyone tell me how to fix it? I have a Verizon Audiovox, with WM 2003 4.21.1008.
The problem is most likely with the SMTP server you're using. Which one are you using? If you're using your "regular" ISP's, you'd probably need some sort of SMTP authentication to be turned on (assuming they support it).