[Exim] Can I shut off "AUTH=" when forwarding to smarthosts?

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Version: Exim 4.32-2
System: Debian testing/unstable

I have a persnickity smarthost that doesn't understand the "AUTH="
option to the MAIL command, yet requires smtp authentication.

I have tried setting authenticated_sender for the "remote_smtp"
transport to "<>", but it STILL includes the "AUTH=" line. I need this
to go away (in a configurable manner, of course).

Any suggestions? Should I be filing a bug report with exim? (I already
reported the problem to the smarthost maintainers.)

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Chad Walstrom <chewie@???>           http://www.wookimus.net/
           assert(expired(knowledge)); /* core dump */
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