[exim] retry time not reached for any host

Hi list,

one of our customers had some difficulties with his Mailserver (for a
couple of hours....). Now it is up and running but Exim still claims:

R=lookuphost T=remote_smtp: retry time not reached for any host after a
long failure period

I tried to search on how to clear this information but somewhat failed. I
only came along exim_tidydb.

Would this be the best way to tell exim, that the hosts now accepts mail
again. If so would "exim_tidydb /var/spool/exim retry" be the correct
option or is there another - perhaps better - solution ?

Thanks and regards
Sascha