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Hello I have SOPHOS XG430 (C4207AFGTD3Y87F) with fimware SFOS 18.0.5 MR-5-Build586 and lisenced like below
I have a problem about email protection , my email from zimbra server cannot send out, and cannot receive message
this email log on web show message like below, always bounced when send out to gmail and another mail
and when i try send from gmail to internal server i have message like below from gmail
what i have todo with my sophos ??
Hey Disko_boyolali, Thanks for reaching out to Sophos Community.
It seems Gmail is rejecting this mail. Can you check your SPF record? I checked on the domain "boyolali.go.id". SPF records has "ip4:103.71.255.106 ip4:103.137.37.3" included. In your mail logs, the mail seems to be going out via IP 103.71.255.234. 
If these IPs belong to the same ISP, Try changing the Outbound IP address via SNAT option in the NAT rule.
If it still doesn't work after making changes, Try setting up DKIM if not because as per google's article, they perform checks for SPF DKIM and DMARC (SPF + DKIM).
Yes, it is different than v17.5. You can find out the Firewall NAT Rule that is used for the mail server or for the similar traffic and in the SNAT Field, Add your IP address.
Example Snapshot:
Check the recommended read for NAT : community.sophos.com/.../how-to-configure-firewall-rule-and-nat-rule-on-sophos-xg-v18
