Yahoo Domain Email
Due to Yahoo’s change in policy to follow DMARC (Domain-based Message Authentication, Reporting & Conformance), which is an email authentication protocol, kindly note that users who’re using a Yahoo domain email for your Shop Email will not be usable by TackThis (and by any other app too), because we are not allowed to send emails on behalf of Yahoo. Emails attempted to send out from Tackthis on behalf of your Shop, such as the Order Notification Email to your customers, will be bounced.
Hence, kindly use a different email for your Shop Email.
Please refer to Yahoo’s change of policy: https://help.yahoo.com/kb/SLN24016.html
You may still be able to keep your Yahoo Email for User Account Login and continue to receive emails from TackThis, however, we will not be able to send emails out using your Yahoo identity.