On Mon, Apr 22, 2019 at 10:41 AM John Capo via mailop <mailop@mailop.org> wrote:
> On Mon, April 22, 2019 11:31, John Leslie wrote: > > I got a surprise trying to confirm a dental appointment > > > > > > status=SOFTBOUNCE (host alt2.aspmx.l.google.com[172.217.192.26] said: > 550-5.7.1 This message does > > not have authentication information or fails to pass 550-5.7.1 > authentication checks. To best > > protect our users from spam, the 550-5.7.1 message has been blocked. > > I see dozens of these daily for mail my customers send to Google but with > 4XX codes. > > Google must be starting to enforce DKIM/SPF/DMARC. > > I've been telling customers that 5XX would be coming and to configure > DKIM/SPF but ... > Is your MTA communicating over IPv6? Many recipients require domain authentication in order to accept mail over IPv6. --Kurt Andersen
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