[exim] error ignored

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Author: Lena
Date:  
To: exim-users
Subject: [exim] error ignored
Exim 4.92 as a smarthost gets a 5xx after end of data, but doesn't send a DSN.
In mainlog (I redacted with asterisks and inserted blanks after @):

2019-06-20 18:28:19 +0300 1hdyz4-000G6A-BR <= Len*@ lena.kiev.ua H=ip-19*6.rusa*ovka-net.ki*v.ua (bedsi*e.lena.kiev.ua) [94.244.2*.38] I=[62.109.6.225]:52*5 P=esmtpsa X=TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=no S=3473 RT=0s id=20190620152815.GG787@???
2019-06-20 18:28:21 +0300 1hdyz4-000G6A-BR ** doma*@ tiscali.cz R=remote_domains T=remote_smtp H=tax.virusfree.cz [212.224.105.18] I=[62.109.6.225] X=TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=no: SMTP error from remote mail server after end of data: 554 message refused (#5.7.1) - for more information visit https://www.virusfree.cz/cs/help
2019-06-20 18:28:21 +0300 1hdyz4-000G6A-BR doma*@ tiscali.cz: error ignored
2019-06-20 18:28:21 +0300 1hdyz4-000G6A-BR Completed QT=2s

I see "error ignored" in deliver.c, but I don't undersand why
in this simple case - a personal message with single recipient.
Why "error ignored"?
My config doesn't contain "errors_to".
Nothing in rejectlog, spool.

I cannot reproduce, repeat message was accepted.