[exim] After upgrade to 0.93

I am seeing in the log

2019-12-10 15:07:52 H=([172.16.4.29]) [172.16.4.29] Warning: Host Lookup
failed
2019-12-10 15:07:52 1ieh7A-0007P6-Is Taint mismatch, Ustrncpy:
rewrite_one_header 611

2019-12-10 15:08:02 H=([172.16.4.29]) [172.16.4.29] Warning: Host Lookup
failed
2019-12-10 15:08:03 1ieh7L-0007P7-AT Taint mismatch, Ustrncpy:
rewrite_one_header 611

2019-12-10 15:17:08 1iehG8-0007XD-FW <= root@??? U=root P=local
S=1736
2019-12-10 15:07:52 H=([172.16.4.29]) [172.16.4.29] Warning: Host Lookup
failed
2019-12-10 15:07:52 1ieh7A-0007P6-Is Taint mismatch, Ustrncpy:
rewrite_one_header 611

2019-12-10 15:08:02 H=([172.16.4.29]) [172.16.4.29] Warning: Host Lookup
failed
2019-12-10 15:08:03 1ieh7L-0007P7-AT Taint mismatch, Ustrncpy:
rewrite_one_header 611

2019-12-10 15:17:08 1iehG8-0007XD-FW <= root@??? U=root P=local
S=1736

and afaict the mail is not delivered.

What have I got wrong?

==John ff