Sending though cox.net

Mail
#1

I have a warning message on the toolbar,

[SMTP]Cannot send message (‘From’ field address ‘k***72@cox.net’ not accepted due to the following reason:
"k***72@cox.net sender rejected
")

The thing is, I have no email in the Outbox, so this error shouldn’t be there.

I redirected the From field from the warning dialog and already sent the message.

#2

Outgoing messages are stored in the Local Folders Outbox. If Local Folders are not visible, you can enable them in Menu > Settings > General > Show Local Folders.

#3

Yes, I checked that.