I'm using Outlook and an imap account for my main email on my desktop. All of a sudden for the last week or so, when I try and send email I get the pop up warning "The server you are connected to is using a security certificate that cannot be verified. The target principal name is not correct. Do you want to continue to use this server?" So every day when I try to send the first email I have to verify the certificate, then it is fine until the next time I power up the desktop and have to go through the verify process again. I have not changed anything on the PC. No new programs installed etc.