Hello TCH folk!
A lot of the time when I try to send email with Mozilla Mail I get an error that says, "An error occurred while sending mail. The mail server responded: sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1). Please verify that your email address is correct in your Mail preferences and try again." I can send mail using NeoMail, Horde, and SquirrelMail. Any ideas are very welcome.