White list IP on SMTP Proxy.
I am using SMTP proxy for an email server and prevent spoofing is enabled. There are some services such as voltage secure email or mailchimp that users do not receiving emails. I assume it s as result of the above or headers.
Being asked to add some IP addresses to the white list so emails coming from those IP go through. I do not seem to find settings for it. Is any setting on it or how can i address that on any way at all?