git send-email sets date

Hello,

git send-email sets the message date to author date.

This is wrong because the message will most likely not get delivered
when the author date differs from current time. It might give slightly
better results with commit date instead of author date but can't is
just skip that header and leave it to the mailer?

It does not even seem to have an option to suppress adding the date
header.

Thanks

Michal