Edit: I didn't see the previous two posts before writing this reply. But if you're expecting to use an email server on a machine then port 25 must be unblocked.
You're double-posting. I replied to the other thread. I'm happy to continue here, but won't repost. Check my reply.
If turning off CSF still didn't resolve the problem it's likely not a firewall problem and resinstalling and tweaking CSF is likely just a waste of time.
I can understand why you don't want to post your real information here but if you don't all we can do is continue to guess, and you can see for yourself that guessing isn't getting anywhere. So either post the correct information including unadulterated log entries, or hire someone you trust to log into your system and fix it for you.
Jeff