Undelivered email returned to sender

New Member
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I can’t work out why I keep getting the following email when someone places an order on my store.

It seems to be only if they have a individual domain, @Gmail @Hotmail etc work fine. I can’t even forward an order confirmation to the recipient unless I use a different email to my store email. 

I’ve already tried to update my txt record on my domain dns settings.

Any help would be great.

This is the mail system at host smtp.shopify.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                  The mail system


 mx10-sx.appslive.com.au [] said: 550 is not  allowed to send mail from @......Please see the SPF record, with scope mfrom, identity @....... and ip