> I really was asking whether it was technically possible to remove the
> header from our end if we encounter the situation more in the future.
>
Well, there's the headers_remove option generic to all routers.
http://www.exim.org/exim-html-current/doc/html/spec_html/ch15.html
Then there's the headers_remove option on transports.
http://www.exim.org/exim-html-current/doc/html/spec_html/ch24.html
This bit of the docs goes into some details about adding and removing headers:
http://www.exim.org/exim-html-current/doc/html/spec_html/ch44.html#SECTheadersaddrem
And you can always try using a system filter.
http://www.exim.org/exim-html-current/doc/html/spec_html/ch43.html#SECTaddremheasys
Have a read through those and see if you think one or more of these would solve your issue. If you
have any more questions, please don't hesitate to ask.
John