Email Lists wrote: > Although this is not specifically on topic, it will help in the big picture > of your overall mail system(s) design and implementation... > > Please do not forget to carefully craft proper SPF records for your domain > or domains... then you would need to deal with SPF issues in the servers as > to what you will and will not accept from others. > > http://www.openspf.org > I won't get into the SPF debate but significant numbers of well experienced mail administrators do not believe in its usefulness at all and that includes admins all across various mtas. eg: SPF breaks forwarding. The real problem is SMTP is outdated. SMTP is broken for today's Internet.