We have a listserv server that sends mail out via on-prem exchange. Exchange is modifying the body of the message, causing DKIM to fail because the body hash changes. Any way to tell exchange to not add this to the body? Content-Type: text/plain
Microsoft Exchange Server doesn't natively support DKIM (DomainKeys Identified Mail).
In Exchange Server, there isn't a direct setting to control the addition of headers like "Content-Type" to email messages, as this is typically handled by the messaging software and not easily configurable.
However, Microsoft 365 (formerly known as Office 365) does support DKIM. If you are using Microsoft 365 for your email services, you can configure DKIM for your domain through the Microsoft 365 admin center.
If you are using an on-premises Exchange Server, and DKIM support is critical for your organization, you might need to consider third-party solutions or additional services that can integrate with Exchange to provide DKIM functionality.