Hello everybody, I hope you are well.
We've newly started to use Business Central and so far things are going very well.
However, we've noticed some customers have not been receiving our invoices via email, mainly those who use Office365 for email. We also use Office365, and Business Central is configured to use the user's account to send the email via Office365 so I cannot understand why this is happening. Our Office 365 is set up correctly, with valid SPF, DKIM, DMARC, MTA-STS configurations in place. We've never had problems sending emails before to these addresses, and /conversational/ emails still go to these customers correctly - it's just the invoices that are failing.
I can see the invoice emails are being transmitted and accepted by the recipients side successfully, so I cannot see any errors in our email transaction logs to work out why this is.
Invoices to non-O365 accounts appear to be received fine.
Can anybody help me with where to look next? I've requested email transaction logs from the recipients IT but have not yet received anything in response.
Thanks in advance