I have two uplink interfaces I need to make sure that the firewall itself (firewall notification system) sends emails to external mail server only from the public interface, because I have another uplink to the internet which is dynamically assigned by the ISP.
So how can I make sure of that?
what i did in the multipath rules
source: any (because i did not know from which interface does UTM sends email)
service: SMTP
destination: External Mail server
itf presistance: by interface
interface: the public interface
it then blocked the outgoing emails from the internal network, but i could accept emails through POP3 but, outgoing email couldnt be sent!!!
any help???
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