On KDE Neon, with kdepim-addons installed, the anti-spam/anti-virus wizards do not appear in the Tools menu of KMail. Package status: $ apt-cache policy kdepim-addons spamassassin bogofilter kdepim-addons: Installed: 18.04.1-0neon+16.04+xenial+build39 Candidate: 18.04.1-0neon+16.04+xenial+build39 Version table: *** 18.04.1-0neon+16.04+xenial+build39 500 500 http://archive.neon.kde.org/user xenial/main amd64 Packages 100 /var/lib/dpkg/status 18.04.0-0neon+16.04+xenial+build38 500 500 http://archive.neon.kde.org/user xenial/main amd64 Packages 17.12.3-0neon+16.04+xenial+build36 500 500 http://archive.neon.kde.org/user xenial/main amd64 Packages 17.12.2-0neon+16.04+xenial+build34 500 500 http://archive.neon.kde.org/user xenial/main amd64 Packages spamassassin: Installed: 3.4.1-3 Candidate: 3.4.1-3 Version table: *** 3.4.1-3 500 500 http://es.archive.ubuntu.com/ubuntu xenial/main amd64 Packages 500 http://es.archive.ubuntu.com/ubuntu xenial/main i386 Packages 500 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages 500 http://gb.archive.ubuntu.com/ubuntu xenial/main i386 Packages 100 /var/lib/dpkg/status bogofilter: Installed: 1.2.4+dfsg1-4build1 Candidate: 1.2.4+dfsg1-4build1 Version table: *** 1.2.4+dfsg1-4build1 500 500 http://es.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages 500 http://es.archive.ubuntu.com/ubuntu xenial/universe i386 Packages 500 http://gb.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages 500 http://gb.archive.ubuntu.com/ubuntu xenial/universe i386 Packages 100 /var/lib/dpkg/status
Are the plugins enabled ? (in settings / plugins)
Oh my goodness I've been trying to solve this for such a long time and never found that. Sorry for the noise.