i have one SBS 2011 server with 10 cliant my setup like below..
- Installed SEP 12.1 RU2 SBE in all client as unmanged
- They have POP3 mail and i connect all user direct with our ISP "POP3 Connecter Disabled"
- Exchange 2010 they user as internal mail
our ISP keep block our mails they said that we have a spam
- i disabled E-Mail Scanner in SEP Client becouse all time they block our email
- Mail Security not installed in Exchange
You should file this question in the SEP section of the forum.
If you don'e have Symantec Mail Security we cannot help much in this section.
i have but i did not installed becouse the Exchange used for internal