Email cannot be sent for mailbox {0} because either a server certificate needed to connect to the email server could not ...

Email cannot be sent for mailbox {0} because either a server certificate needed to connect to the email server could not be validated or the credentials used to send email are incorrect or do not provide access. Mailbox {0} didn't synchronize. A notification about this is posted on the alerts wall for the owner of the email server profile {1}.