Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
application()
application(kmail_view.desktop)
application(org.kde.kmail2.desktop)
config(kmail)
kmail
kmail(x86-32)
kmail5
libkmailprivate.so.5
metainfo()
metainfo(org.kde.kmail2.appdata.xml)
mimehandler(application/mbox)
mimehandler(application/x-mimearchive)
mimehandler(message/rfc822)
mimehandler(x-scheme-handler/mailto)

Requires :

/bin/sh
/sbin/ldconfig
/sbin/ldconfig
config(kmail) = 17.12.2-1.2
kdepim-addons
kdepim-runtime
kmail-account-wizard
kmail-application-icons
libKF5AkonadiAgentBase.so.5
libKF5AkonadiContact.so.5
libKF5AkonadiCore.so.5
libKF5AkonadiMime.so.5
libKF5AkonadiSearchDebug.so.5
libKF5AkonadiSearchPIM.so.5
libKF5AkonadiWidgets.so.5
libKF5Bookmarks.so.5
libKF5CalendarCore.so.5
libKF5CalendarUtils.so.5
libKF5Codecs.so.5
libKF5Completion.so.5
libKF5ConfigCore.so.5
libKF5ConfigGui.so.5
libKF5ConfigWidgets.so.5
libKF5Contacts.so.5
libKF5CoreAddons.so.5
libKF5Crash.so.5
libKF5DBusAddons.so.5
libKF5FollowupReminder.so.5
libKF5Gravatar.so.5
libKF5GuiAddons.so.5
libKF5I18n.so.5
libKF5IconThemes.so.5
libKF5IdentityManagement.so.5
libKF5ItemModels.so.5
libKF5ItemViews.so.5
libKF5JobWidgets.so.5
libKF5KCMUtils.so.5
libKF5KIOCore.so.5
libKF5KIOFileWidgets.so.5
libKF5KIOWidgets.so.5
libKF5KSieveUi.so.5
libKF5KontactInterface.so.5
libKF5Libkdepim.so.5
libKF5LibkdepimAkonadi.so.5
libKF5Libkleo.so.5
libKF5MailCommon.so.5
libKF5MailTransport.so.5
libKF5MailTransportAkonadi.so.5
libKF5MessageComposer.so.5
libKF5MessageCore.so.5
libKF5MessageList.so.5
libKF5MessageViewer.so.5
libKF5Mime.so.5
libKF5MimeTreeParser.so.5
libKF5Notifications.so.5
libKF5NotifyConfig.so.5
libKF5Parts.so.5
libKF5PimCommon.so.5
libKF5PimCommonAkonadi.so.5
libKF5PimTextEdit.so.5
libKF5SendLater.so.5
libKF5Service.so.5
libKF5SonnetUi.so.5
libKF5TemplateParser.so.5
libKF5TextWidgets.so.5
libKF5Wallet.so.5
libKF5WebEngineViewer.so.5
libKF5WidgetsAddons.so.5
libKF5WindowSystem.so.5
libKF5XmlGui.so.5
libQt5Core.so.5
libQt5Core.so.5(Qt_5)
libQt5Core.so.5(Qt_5.10)
libQt5DBus.so.5
libQt5DBus.so.5(Qt_5)
libQt5Gui.so.5
libQt5Gui.so.5(Qt_5)
libQt5Network.so.5
libQt5Network.so.5(Qt_5)
libQt5Widgets.so.5
libQt5Widgets.so.5(Qt_5)
libQt5Xml.so.5
libQt5Xml.so.5(Qt_5)
libc.so.6
libc.so.6(GLIBC_2.0)
libc.so.6(GLIBC_2.1.3)
libc.so.6(GLIBC_2.3.4)
libc.so.6(GLIBC_2.4)
libgcc_s.so.1
libgcc_s.so.1(GCC_3.0)
libgpgmepp.so.6
libkmailprivate.so.5
libpthread.so.0
libpthread.so.0(GLIBC_2.0)
libqgpgme.so.7
libstdc++.so.6
libstdc++.so.6(CXXABI_1.3)
libstdc++.so.6(GLIBCXX_3.4)
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsXz) <= 5.2-1

Content of RPM :
/etc/xdg/kmail.categories
/etc/xdg/kmail.renamecategories
/usr/bin/akonadi_archivemail_agent
/usr/bin/akonadi_followupreminder_agent
/usr/bin/akonadi_mailfilter_agent
/usr/bin/akonadi_sendlater_agent
/usr/bin/kmail
/usr/lib/libkmailprivate.so.5
/usr/lib/libkmailprivate.so.5.7.2
/usr/lib/qt5/plugins/kcm_kmail.so
/usr/lib/qt5/plugins/kcm_kmailsummary.so
/usr/lib/qt5/plugins/kcm_kontactsummary.so
/usr/lib/qt5/plugins/kcm_kpimidentities.so
/usr/lib/qt5/plugins/kmailpart.so
/usr/lib/qt5/plugins/kontact_kmailplugin.so
/usr/lib/qt5/plugins/kontact_summaryplugin.so
/usr/share/akonadi/agents
/usr/share/akonadi/agents/archivemailagent.desktop
/usr/share/akonadi/agents/followupreminder.desktop
/usr/share/akonadi/agents/mailfilteragent.desktop
/usr/share/akonadi/agents/sendlateragent.desktop
/usr/share/applications/kmail_view.desktop
/usr/share/applications/org.kde.kmail2.desktop
/usr/share/config.kcfg/archivemailagentsettings.kcfg
/usr/share/config.kcfg/kmail.kcfg
/usr/share/dbus-1/interfaces/org.kde.kmail.kmail.xml
/usr/share/dbus-1/interfaces/org.kde.kmail.kmailpart.xml
/usr/share/doc/HTML/en/akonadi_archivemail_agent
/usr/share/doc/HTML/en/akonadi_archivemail_agent/add-archive-mail.png
/usr/share/doc/HTML/en/akonadi_archivemail_agent/configure-archive-mail-agent.png
There is 86 files more in these RPM.