On 21 Jul 2016, at 18:58, Steve Jenkins <st...@stevejenkins.com> wrote: > > If you're looking into Postscreen whitelisting, you might consider including > Postwhite in your solution: > > http://www.stevejenkins.com/blog/2015/11/postscreen-whitelisting-smtp-outbound-ip-addresses-large-webmail-providers/ > > <http://www.stevejenkins.com/blog/2015/11/postscreen-whitelisting-smtp-outbound-ip-addresses-large-webmail-providers/> > > It helps you whitelist trusted senders' known SMTP IP addresses based on > their published SPF records. You can choose which mailers to whitelist and > add easily your own.
This is a CIDR based access list and you have to know the IP but Gmail for example changes often so something like ".google.com accept” or “.hotmail.com reject” would make life much much easier.
