Locally specific `bash` or `zsh` configurations can be put into `$HOME/.$SHELL_local` and they will be applied as a superset of the main `.$SHELLrc` file.
Using `mutt` requires that you also `stow` the helper scripts to get access to `pw.sh` and that you include `IMAP_USERNAME` and `IMAP_PASSWORD` in the .env file.
### khard / vdirsyncer
Using `khard` and `vdirsyncer` requires that you also `stow` the helper scripts to get access to `pw.sh` and that you include `CARDDAV_USERNAME` and `CARDDAV_PASSWORD` in the .env file.