Summary: This problem is usually caused by a corrupt setting in Norton or Symantec Anti-Virus. Norton or Symantec Antivirus sits between Outlook/Outlook Express and the mail server, thereby scanning every message that passes through the SMTP gateway. If Norton or Symantec Antivirus is malfunctioning, then Outlook/Outlook Express can not properly connect to the mail server and thus the program displays one of the two error messages mentioned in the title of this error.
Resolution: Sometimes this problem can be solved by simply restarting the computer.
Resolution: Sometimes this problem can be solved by simply restarting the computer.
