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Shopify Email Undelivered Error

Hi all,
Ive recently migrated my ecommerce site from squarespace to shopify. I've been trying to track down an error message delivery failure when customers place an order. The customer appears to get the order confirmation email but I still receive undeliverable mail errors in my inbox. It goes as follows

This is the mail system at host smtp-relay.ash.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
<emailremoved*>: host mail.names.gd[8.14.136.111] said: 551 This mail
    server requires authentication before sending mail from a locally hosted
    domain. Please reconfigure your mail client to authenticate before sending
    mail. (in reply to MAIL FROM command)

I have followed the shopify instructions and included the necessary SPF record. But I am still getting the undelivered error. Any thoughts on resolving this matter?