[arch-general] Removal of ssmtp

Hey all, I have just removed ssmtp from [community]. Apart from it being unmaintained upstream, it has known security issues (e.g. [1]). I highly recommend _not_ using and removing it, in the case you have been using it. As replacements have a look at `pacman -Ss smtp-forwarder`. Best, David [1] https://bugs.archlinux.org/task/60502 -- https://sleepmap.de