"An unknown error has occurred. Account: 'XXXXX', Server: 'smtp.comcast.net', Protocol: SMTP, Server Response: '421 Cannot connect to SMTP server 76.96.62.117 (76.96.62.117:25), connect error 10060', Port: 587, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67" I have been unable to send email with my Outlook Express. The inbox receive works. Just the send does not.1 person got this answerI do too