I can receive email with attachments with no problem. I can send email without attachments with no problem. Whenever I attempt to send an email with any attachment, the system times out and gives me an error message "Task 'mail.comcast.net - Sending' reported error (0x8004210B) : 'The operation timed out waiting for a response from the sending (SMTP) server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).' " It does not seem to be the program - Outlook - since I tried another email program and got the same results. My wife sends emails with no problem on another computer in the same network and same ISP. My gut tells me it is windows Vista Home Premium since it all started with the new computer.