outgoing mail suddenly rejected by ISP
since 5/6 days my outgoing mail is rejected by ISP and stays in the outbox after all worked fine for several month.
Browsing the internet like being here..... receiving mail from a different account all works fine, through the same wireless ISP connection, which suddenly rejects my outgoing mail.
confusing is that Airport Utilities can't find any wireless devise , even so I am using it, see screenshot
MacBook Pro, Mac OS X (10.6.7)