Ville Walveranta wrote: > Does the domain name that comes after > "smtp:" need to be the external filtering service's MX directly, or a > domain name whose MX records point to the external filtering service's > MX?
It can be either, as documented here under "Result Format". http://www.postfix.org/transport.5.html # performs MX lookup example.com smtp:filtering-service.com # suppresses lookup, attempts to resolve the hostname directly example.com smtp:[mx01.filtering-service.com] You probably want the first one, they could change the DNS without warning.
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