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$ kmail
kmail: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/libkmailprivate.so.5)
kmail: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/libKF5MailCommon.so.5)
kmail: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/libKF5KSieveUi.so.5)
kmail: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/libKF5MessageList.so.5)
kmail: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/libKF5MessageComposer.so.5)
kmail: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/libKF5TemplateParser.so.5)
kmail: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/libKF5MessageViewer.so.5)
kmail: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/libKF5AkonadiMime.so.5)
kmail: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/libKF5WebEngineViewer.so.5)
kmail: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/libKF5MimeTreeParser.so.5)
kmail: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/libKF5Ldap.so.5)
kmail: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/libKF5AkonadiSearchPIM.so.5)
kmail: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/libKF5IMAP.so.5)

I have just installed KMail via Discover but it refuses to start. Can not find any such package mentioned above under libstdc++ in my distro repo.

I have managed to check that /usr/lib/libstdc++.so is present so started to look what package it belongs to. As I don't know the pacman command to look for the package name from a given filename, after a lot of searching I detremined the file was in the gcc-libs package.

As the current version in the repository was newer than my local one updating gcc-libs did the trick.