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Sending from Google Apps to Office 365 through the same server

Discussion in 'E-mail Discussion' started by peter-wetink, Jul 20, 2016.

  1. peter-wetink

    peter-wetink Member

    Dec 16, 2013
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    Hi everyone, apologies if this is not the right place to ask but I'm really struggling here.

    I have a dedicated server with (my domain) and (a client domain) on it. uses Google Apps and has MX and SPF records on it, its nameservers are those from the dedicated server. In the google apps account I have also added the server IP under "Email routing" without changing the SMTP envelope. uses Office 365 and has the nameservers set to and with an A record pointing to their website and a CNAME for the www can send emails to any domain apart from can send emails to

    When I try to send an email from to I get the following response:

    The error that the other server returned was:
    550-Please turn on SMTP Authentication in your mail client.[]:35298 is not permitted to relay
    550 through this server without authentication.

    What do I need to do to get this running through correctly?
  2. cPanelMichael

    cPanelMichael Technical Support Community Manager
    Staff Member

    Apr 11, 2011
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    Could you elaborate on the cPanel server's role in this email configuration? Are you using a custom Exim rule?

    Thank you.
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