A few years ago my wife and I decided to stop using talktalk as our e mail address. At first all was well but gradually I have noticed that more and more emails are being rejected because the original talktalk address is being used to try and send emails. this results in a DMARC error (Remote server returned '554 5.7.0 < #5.7.26 smtp; 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 550-5.7.26 the DMARC initiative, go to 550 5.7.26 https://support.google.com/mail/?p=DmarcRejection ffacd0b85a97d-3a4e91465d2sor4147234f8f.5 - gsmtp>') these have been getting gradually more frequent and the importance of the missing mails has been getting more important also. I have noted that these rejected mails were sent to or from one of my existing mail addresses
