Opening a hole from DMZ to inside is no different than from outside to inside. I assume you are having trouble getting something to work. We need more details of your problem, eg what you tried and how it didn't work.
1. Try allowing ident packets back into your net from the mail server.
2. try disabling the 'fixup protocol smtp 25' statement
The first solution will fix a known issue with SMTP servers trying to use IDENT to verify the source of a mail message. This will probably only be the case if the mail...
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