Exchange Server 2003 SMTP Crashed

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-------------------[ Network Design ]----------------------------
Computer-1: Exchange Server 2003(sp2) + Windows Server 2003 (sp2)
Computer-2: Domain Controller, Windows Server 2003 (sp2)
Pix-Firewall Protecting Internal Network
Cisco Router Connected to ISP
A Week before, All external emails stop receiving, users can send/receive to Internal Network users but can't receive emails from External domains/Networks, also users can send emails to external domains (internet)

I have Checked every Possibility like, turn off firewall Access-lists, Reinstall smtp, reinstall IIS, reinstall Exchange server, Even re-install the whole windows and then recovered the mailboxes (which i had taken backups before) Database mounted successfully but again it crashed the smtp.

Now what i mean by crashing smtp is: when i telnet smtp from The Exchange Server (telnet 25) i see nothing it again comes to C:> Prompt without giving me any message. I get same message when telnet from outside or inside, or by ip or by hostname etc.

I used smtpdiag and i get the message

--------------------[SMTPDIAG MESSEGE]-----------------------
Both TCP and UDP queries succeeded. Remote DNS test passed.

Checking MX servers listed for administrator(at)
Connecting to [url removed, login to view] [213.x.x.x] on port 25.
Error: Expected "220". Server is not accepting connections.
Failed to submit mail to
Connecting to [url removed, login to view] [213.x.x.x] on port 25.

I need a guy who is 100% confident to solve this problem, BUT I'M ONLY WORRIED ABOUT THE OLD MAILBOXES, I dont wanna lose that in any case.

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