I've recently changed ISP's and while configuring my e-mail settings on my old iMac (which I gave to my 7 year old) which runs OS 8.6, we realized we could receive, but not send e-mail. We get the error message 5530 "authentication required". When I went into ACCOUNTS and clicked on advanced settings, there seems to be a box missing in Outlook Express version 5.01 (1630) that would allow me to uncheck "SMTP Server requires authentication". That option is not there, and tech support at my ISP is stumped. Any ideas?