[exim] remote smtp 521. Exim drops email silently! Bug?

I got remote mail server that for some reason don't accept connections
from my IP this way:
# nc mx.poczta.onet.pl 25
220-mx.poczta.onet.pl ESMTP
521 5.7.1 Service unavailable; client [5.9.116.9] blocked using
postscreenbl.opbl.onet.pl.

Which is fine but my exim drops email from queue silently, no delivery
attempt is logged and bounce is not generated which obviously is
terrible.

2021-04-01 01:54:45 1lRkfc-0001w9-TQ <= test@xxxxxxxx H=(xxxxxxxx)
[127.0.0.1]:53112 I=[127.0.0.1]:587 P=esmtpa
A=fixed_plain:test@xxxxxxxxx S=1159
id=c90e9f920c38d302dfe2e213ab7b9cbc@xxxxxxxxxx T="test" from
<test@xxxxxxxxx> for sdfadbvzxcbert@???
2021-04-01 01:54:45 cwd=/var/spool/exim 3 args: /usr/exim/bin/exim -Mc
1lRkfc-0001w9-TQ
.