Server Error for pop3.norton.antivirus
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This could happen if you have an AntiVirus product that intercepts email by
downloading it from the server for you. When you check email, your email client
asks this program to do the work.
Try uninstalling your Norton product
and making the SSL changes (the POP server should be email.psu.edu not
pop3.norton.antivirus. Then try checking mail to make sure that it works.
Finally, reinstall Norton.
If this does not work, you can uninstall the AntiVirus and get a free copy that
will work at https://downloads.its.psu.edu