Single Email v Mass Email configuration.
When sending mass emails I get a considerable number of "Bounce backs" possibly through using Office 365 advanced filters.
Sending a single email is OK as the smtp.mailfrom and header.from fields match as below:
smtp.mailfrom=qgbiz.co.uk; companyname.co.uk; dkim=pass (signature was
verified) header.d=qgbiz.onmicrosoft.com;companyname.co.uk;
dmarc=bestguesspass action=none
header.from=qgbiz.co.uk;compauth=pass
reason=109
When sending a mass mail the smtp.mailfrom and the header.from details do not match and so it fails.
smtp.mailfrom=mailer.zohocrm.eu;
company name.co.uk; dkim=pass (signature
was verified) header.d=mailer.zohocrm.eu;companyname.co.uk; dmarc=none
action=none
header.from=qgbiz.co.uk;compauth=fail reason=001
Is there anyway this can be overcome to stop the advanced filter rejecting the email.