Several popular free email providers, including Yahoo! and AOL, have recently changed some of their policies regarding mail delivery, and it may affect the delivery of email notifications (such as order notifications) from your website.
Many email providers use a technical specification called DMARC ("Domain-based Message Authentication, Reporting & Conformance") to help reduce email-based abuse like the sending of forged/spoofed spam email. DMARC is used by receiving inboxes and is checked when an email has a 'from' address that doesn't match the actual sender server address.
In terms of the impact of this change for our customers, our notification emails are sent using the outgoing server of our email provider, but will appear to be from whichever email address you provide (such as firstname.lastname@example.org). As per the new DMARC policies, these emails will now be rejected automatically.
This also affects forwarding of email messages received from Yahoo! and AOL addresses. Because forwarding changes the outgoing mail server, the message will not be received by the forward address because the sender no longer matches the sender's mail server.
For this reason, we now recommend that you use an email address that matches your domain name when sending email notifications. If your web host includes email addresses, you can create an email address by navigating to Edit Site > Domain & Email > Email.
HOW TO UPDATE YOUR SENDER EMAIL ADDRESSES
To edit the sender email address for order notifications, navigate to Edit Store > Shopping Cart and visit the 'Settings' page on the left.
To edit the sender email address for feedback form notifications, edit the feedback form page and visit the 'Options' page on the left.
To edit the sender email address for autoresponders, edit the autoresponder page and visit the 'Auto-Response Email' page on the left.
If you have any questions about DMARC or email notifications, please contact our support team.