Place me.mailcatcher.plist into ~/Library/LaunchAgents, then run launchctl load ~/Library/LaunchAgents/me.mailcatcher.plist
.
If you use pow, echo 1080 > ~/.pow/mailcatcher
and go to http://mailcatcher.dev, otherwise use http://localhost:1080.
Currently pow doesn't seem to pass websockets through correctly. Looking into this.
THX!
If you use RVM you need to install Mailcatcher into a dedicated gemset (https://github.com/sj26/mailcatcher#rvm) and maybe use the full path to the mailcatcher executable inside the .plist ("~/.rvm/bin/mailcatcher").