Am 27.03.2014 08:45, schrieb martijn.list: > as anyone on this list has any experience in setting up an outbound > gateway for Google Apps and/or Exchange online? > > If so any ideas how to make sure this will work without any problems?
whatever microsoft or google does, it maybe ok to allow relay outbound with postfix for fixed "trusted" and "controlled" ips and nets, for dynamic ips, only allow relay with auth sasl, and maybe limit to sender domain etc. If relayed mails bounce by i.e forwarding strict spf domains at recipient mailserver it works like designed. Best Regards MfG Robert Schetterer -- [*] sys4 AG http://sys4.de, +49 (89) 30 90 46 64 Franziskanerstraße 15, 81669 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
