EN VI

(Swift_TransportException(code: 550): Expected response code 250 but got code \"550\", with message

(Swift_TransportException(code: 550): Expected response code 250 but got code \"550\", with message \"550 5.7.1 Client does not have permissions to send as this sender?

How to fix it?

Solution:

To resolve this, you will need to assign 'Send as' permissions to the affected users. To do this for Exchange 2007, follow the below instructions:

Log in to the server running Exchange.
Open Active Directory Users and Computers.
Under the View menu, enable the Advanced Features option (if disabled).
Locate the account of the user to which you want to assign the 'Send as' permission, right-click on it and select Properties.
Select the Security tab.
Under Group or user names, click Add to add the users or group that is to be granted permission to.
For each account added, highlight the account under Group or user names, and in the Permissions for window, grant 'Send As' permission to the account.
Click OK to close the dialog.