Exim: retry time not reached for any host after a long failure period

Ошибка может появиться, если бьются базы exim'а.
# exim -Mvl 1ab5H4-0004J9-5c
2016-03-02 14:49:02 Received from [email protected] U=webmaster P=local S=50407
2016-03-02 14:49:02 [email protected] R=dnslookup T=remote_smtp defer (-53): retry time not reached for any host

Решение:
# cd /var/spool/exim/db
# rm retry retry.lockfile wait-remote_smtp wait-remote_smtp.lockfile
# service exim restart