I also have this effect here, log say mail is quarantined, journal show it:
root@mx01:~# journalctl |grep 3741E6613C38B2A7F5
Apr 08 10:14:35 mx01 pmg-smtp-filter[348601]: 3739A6613C36A0B2CF: moved mail for <xxxx@yyyy.com> to virus quarantine - 3741E6613C38B2A7F5 (rule: Block Viruses)
Apr 08...