How do I remove the X-SA-Exim headers from outgoing emails?
Exim has a headers_remove option which can be used in the transport section of your configuration.
If the transport section has:
driver = smtp
port = 25
hosts_require_auth = $host_address
hosts_require_tls = $host_address
Add the following line to the end:
headers_remove = X-SA-Exim-Connect-IP:X-SA-Exim-Mail-From:X-SA-Exim-Scanned:X-SES-Outgoing:
Update the config with update-exim4.conf and reload exim4.