I can confirm that this bug exists in 1:52.4.0-1, as well as 1:52.4.0-1~deb9u1 and 1:52.5.0-1. It seems to be the same as the bug discussed at the following two links:
https://bugzilla.redhat.com/show_bug.cgi?id=1489966 https://bugzilla.mozilla.org/show_bug.cgi?id=1371309 The workaround discussed at the Redhat link (turn off LDAP address checking) does not seem to work for me, but adding all email recipients to my address book does. - Anne
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