Some email service providers add this note when messages say they're from one domain but actually come from another.

When you send from your business email account (like info@widgetdesigns.com) the message actually goes out from Yahoo's mail servers--those say yahoo.com. Since these two domain names are different, the mail service may show your message as being from info@widgetdesigns.com via yahoo.com.

This can often be resolved by adding a Sender Policy Framework (SPF) record to your domain's TXT file. Learn more about SPF records.

Note: Adding an SPF record does not guarantee removal of the via yahoo.com message on third party mail providers.