Error: "Can‘t open temporary file, do you own it?"

This error message comes from your Internet Provider, not from Emailer.

This information was provided by Claris Corporation on 16 March 1998, and incorporated into Apple Computer's Tech Info Library.

Issue:
When I try to connect to my Internet Provider, I can't get my mail and I get the following error message in my Connection Log:

Execution of Schedule "Connect Now" at Thu, Sep 19, 1996
Connecting To Internet using Account "My Internet Account"
Checking for mail
** -ERR System error, can't open temporary file, do you own it?

Answer:
This error comes from the mail server at your Internet Provider. It is not a Claris Emailer issue. If you continually get this message, you can call your provider and ask them to solve the problem with the temporary file on their server.
Published Date: Feb 18, 2012