Office365 Permanent Delivery Failure Errors
Jul 11, 2013 01:01 PM
The following message had PERMANENT fatal delivery errors!
<<< 550 5.7.1 Client does not have permissions to send as this sender
This is an issue with Office 365 in that by default they only allow outbound messages to be From: the email address that is logging in to send the message.
So if you have your Message Destination in MailFlow configured to authenticate to Office 365 as the user
but the outbound message is from a different email address then you will receive the error 550 5.7.1 Client does not have permissions to send as this sender.
To resolve this issue you have to add your MailFlow From: email addresses to the Office 365 account that is configured in the Message Destination.
You can follow the steps at this link to add them:
Go to the section titled "How to support multiple email addresses" and follow the steps in "Method 2: Add proxy addresses".
So if you have a TicketBox in MailFlow with an email address of
you need to add the
email address as a Proxy Address to the
Office 365 account. This will allow outbound email From:
to be sent via the
Office 365 account.