thanks Viktor. this is what I was ultimately trying to achieve: https://kolabsys.com/howtos/secure-kolab-server.html#postfix
So you are saying there is no point in securing outbound email in postfix? On Wed, Feb 15, 2017 at 6:17 PM, Viktor Dukhovni <postfix-us...@dukhovni.org> wrote: > >> On Feb 15, 2017, at 2:10 AM, Henry <der...@gmail.com> wrote: >> >> When I send a message to Gmail I am informed that it could not be >> authenticated and will probably end in the spam folder. > > This is largely misinformation. Sites that send bulk mail that might > get classified as junk may benefit from DKIM signing and SPF records > provided they also enroll in some kind of whitelisting program that > requires such measures. > > Otherwise, since both DKIM and SPF are used as much by spammers as > by non-spammers, there is no hard requirement to use these. My > domain does not use either. > > "Authentication" in the context of sending mail means either or both > of DKIM or SPF. > >> I understand >> the resolution to this is to obtain an SSL certificate and configure >> postfix to use that certificate. > > That simply wrong. Certificates have no bearing on outbound deliverability. > > http://postfix.1071664.n5.nabble.com/Best-way-to-run-Postfix-on-a-single-server-for-multiple-domains-td88720.html#a88811 > > -- > Viktor. >
