Gmail have now on two occasions not accepted emails I have sent to two separate email accounts. I keep getting the following message:-
(reason: 550-5.7.26 Unauthenticated email from talktalk.net is not accepted due to)
----- Transcript of session follows -----
... while talking to gmail-smtp-in.l.google.com.:
>>> DATA
<<< 550-5.7.26 Unauthenticated email from talktalk.net is not accepted due to
<<< 550-5.7.26 domain's DMARC policy. Please contact the administrator of
<<< 550-5.7.26 talktalk.net domain if this was a legitimate mail. To learn about
Both contacts have confirmed the email has not been received, and has not been placed in spam.
Apparently the domain needs a DKIM how do I get this?
