remote mx
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Strange Exchange Online error when sending emails to users that are on another server
Hi, Given that: mycompany.com and mycompany2.com have been added and verified in an Office 365 tenant (mycompany.onmirosoft.com). The MX records of mycompany.com points to mycompany-com.mail.protection.outlook.com The MX records of mycompany2.com points to mx.mycompany2.com (not Office 365) Some of the users from mycompany2.com have been added on the Office 365 tenant mycompany.onmicrosoft.com for testing purposes, however, most of the users are still on the current cPanel-based email server. The MX records still point to the current cPanel-based Dovecot email server, mx.mycompany2.com. So, we're expecting that any emails sent from anywhere to anything@mycompany2.com, goes to the mx.mycompany2.com email server. It works as expected, except when sending an email from within the Office 365 tenant. Instead of sending the email to mx.mycompany2.com, it tries to find the user in the Office 365 tenant and obviously, it doesn't exist yet. So, the email gets rejected as 'The recipients weren't found at mycompany2.com' This is a strange error. How can I fix this?Solved4.4KViews0likes6Comments