Hi, I haven't had any issues with Shopify emails until today (28 Oct 2020).
I can't communicate with my customers via Shopify email, the email bounces back .....
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 the postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message.
The mail system
558 5.7.1 5F725E5B0892039E Message content rejected due to suspected spam. IB703 (in reply to end of DATA command) Reporting-MTA: dns; smtp.shopify.com X-Postfix-Queue-ID: 774EE84CAC X-Postfix-Sender: rfc822; Arrival-Date: Thu, 29 Oct 2020 05:47:11 +0000 (UTC)