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Failed to send outgoing mail from Zimbra outgoing relay

Model: SG310
Firmware version: 9.207-19

I have working Zimbra server, the outgoing and incoming are perfect. Until the company bought the email protection license. I've activated the SMTP proxy with config shown below, but I always got the error "loops back to myself". The incoming mails are working fine.

UTM

Simple Mode
Routing: domain.com.ph (example)
Route by: static host
Host list: Zimbra server
Advanced: Transparent mode
Hostname: mail.domain.com.ph (example) 
Everything was default

Traffic selector: Any → Email Messaging → EXTERNAL ISP [MAIL] (Address)
Destination translation: Mail Server Local
Automatic Firewall rule: on

No user created firewall rule.

Zimbra:
Hostname: mail.domain.com.ph (example) 
Do I need to point MTA to relay to UTM? Or do I need to do something on this server?

Can you help me out? I'm willing to try everything, our local support also seems doesn't know how to fix it.

Thanks


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