reject=553 5.3.0 127.0.0.2 due to unreachable DNS resolver

Hello!

I had a situation where my DNS resolver was unreachable for my machine.

root@pi-dach:~# grep FEATU /etc/mail/sendmail.mc
FEATURE(`no_default_msa')dnl
FEATURE(`require_rdns')dnl
FEATURE(`use_cw_file')dnl
FEATURE(`access_db', , `skip')dnl
FEATURE(dnsbl,`dnsbl-1.uceprotect.net')dnl
FEATURE(enhdnsbl,`zen.spamhaus.org', `"554 Connecting client IP address listed in Spamhaus. See https://check.spamhaus.org"', `127.0.0.2', `127.0.0.3', `127.0.0.4', `127.0.0.9', `127.0.0.10', `127.0.0.11')dnl
FEATURE(dnsbl,`all.bl.blocklist.de')dnl
FEATURE(`dnsbl', `bl.spamcop.net', `"Spam blocked see: http://spamcop.net/bl.shtml?"$&{client_addr}')dnl
FEATURE(enhdnsbl,`dnsbl-2.uceprotect.net', `"454 4.7.1 Listed in uceprotect Level 2')dnl
FEATURE(enhdnsbl,`dnsbl-0.uceprotect.net', `"454 4.7.1 Listed in uceprotect Level 0')dnl
FEATURE(enhdnsbl,`dnsbl-3.uceprotect.net', `"454 4.7.1 Listed in
uceprotect Level 3')dnl

Jan 31 23:37:37 pi-dach sm-mta[1034127]: ruleset=check_relay,
arg1=[157.230.63.40], arg2=157.230.63.40, relay=[157.230.63.40],
reject=553 5.3.0 127.0.0.2

The remote machine gave

<uk-legal-moderated@moderators.isc.org>: host pi-dach.dorfdsl.de[82.139.252.17]
    said: 553 5.3.0 127.0.0.2 (in reply to MAIL FROM command)

If that is related to a non-resolvable domain (DNS timeout), what is the
reason for this strange error message?

The dnsbl features give back different messages.

--
kind regards
Marco

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