[exim] Hints in retry database has wrong MX - how to refresh…

Hi!

I've got such situation, when user sends email resolver find wrong MX
records for domain (wrong or MX was changed in meantime). The email
can't be delivered to MX due to connection timeout error. Now I can see
that destination domain has different MX that those in retry database.
How I can tell exim to refresh MXes for mails in queue?

Have a nice day!
Marcin