We are using Microsoft® Outlook® 2016 MSO (16.0.13929.20206) 32-bit as our email server. Our outgoing emails are getting rejected by yahoo and others.
Delivery has failed to these recipients or groups: firstname.lastname@example.org (email@example.com) Your message wasn't delivered because the recipient's e-mail provider rejected it. The following organization rejected your message: DM6NAM10FT014.mail.protection.outlook.com.
Diagnostic information for administrators: Generating server: SD-EXCHANGE-01.shuckdrillingco.local firstname.lastname@example.org DM6NAM10FT014.mail.protection.outlook.com #550 5.7.64 TenantAttribution; Relay Access Denied [DM6NAM10FT014.eop-nam10.prod.protection.outlook.com] ## Original message headers:
Received: from SD-EXCHANGE-01.shuckdrillingco.local ([::1]) by