Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender.

Version 4

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    Issue/Case Scenario:


    We currently have 3 separate mailboxes mapped in LANDESK Mail Manager, from the 3 mailboxes 2 of them are mapped to the Incident process and the third is mapped to a "HR" Process.


    Outbound and Inbound emails seem to work fine until we check the box in mail manager "Outbound Email to use Inbound Mailbox". Following this update, the application error log fills up with the error Mailbox unavailable. "The server response was: 5.7.1 Client does not have permissions to send as this sender. for the outbound service".



    When using the function of "Outbound Email to use Inbound Mailbox" we are of course wanting to send out Emails/Reminders to users from the same email address as they used to raise a ticket with the Service Desk for a particular process, instead of the email address specified in the "Outbound Mail Server Settings". 

    When mail manager polls and raises tickets, the credentials entered in the mailbox are used to read and raise a ticket from a user and the same logic applies when ServiceDesk is wanting to send an email from a particular e-mail address, if the account does not have permissions to "Send As" or "Send on Behalf" then emails will not be sent, thus generating the error message in the event log.




    Ensure that within your Email environment, the account specified within the Mailbox has permission to send mails as well read mails.



    The inbound mailbox is: [email protected] and outbound is [email protected].

    Give send as [email protected] permission to [email protected] in the Office365/Exchange server.

    If "Outbound Email to use Inbound Mailbox" is enabled, notifications will be sent out from [email protected].