"Sending of the message failed. An error occurred while sending mail. The mail server responded: Request failed; Mailbox unavailable. Please verify that your email address is correct in your account settings and try again."..........This is what I get by simply trying to send an email. No problem looking at messages. The support page seems to love complications. So, it's back to Gmail for me. Nice and simple. Thanks anyway.
Alla svar (1)
Please post screenshot of incoming and outgoing server panes and I will attempt to assist. Thank you.