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kmail and malformed dates

I regularly receive mails from my energy provider which, I believe, have an 
over-complex and malformed date field.

The latest mail has the date field as:

Date: Saturday, 06 May 2017 06:09:47 +01:00

Kmail is unable to parse this field and, as the date is not present, the mail 
becomes the oldest in the mailbox.

I recognize that it is unreasonable to expect kmail to parse badly formatted 
dates but if no valid date is found why can kmail not assume today's date, 
though not display it, and put the mail at the head of the list?

I have requested a change to be made by the energy provider but am not holding 
my breath!

Kindest regards

Peter Lewis