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Email problems / 100% Failure Notices

Email problems / 100% Failure Notices

Hi there,

I hope someone can help us or can give us a tip or direction how to solve the next problem?

We started using the standard build in email from magento 2. Only we found out a lot/most emails that customers would receive goes directly in their spam folder because fe. Google mention "Gmail cannot verify that this message was sent by (and not by a spammer)"

After a heavy discussion for 4 weeks with our supplier they recommended a SMTP extension so we went for Aitoc's SMTP which being installed. After installing and we did setup all credentials/ports etc we got only failure notices after magento 2 sends automatic order, invoice, contactform emails, all came back with error code 550; failed after I sent the message.
Remote host said: 550 Messages should have one or no Content-Type headers, not 2.

--- Below this line is a copy of the message.
Received: (qmail 2976 invoked from network); 27 Aug 2020 16:49:59 -0000
Received: from unknown (HELO ([])
by with ESMTPSA (DHE-RSA-AES128-GCM-SHA256 encrypted, authenticated); 27 Aug 2020 16:49:59 -0000
Date: Thu, 27 Aug 2020 16:49:55 +0000
From: CustomerSupport Copyshop De Haan

Please if you have some tips, thoughts etc we would appreciate these!
Thanks in advance