Since Homestead v6 multiple PHP versions in one homestead vagrant box are possible. The latest Laravel-Version with Homestead including PHP 5.6 is Laravel 5.6. See https://laravel.com/docs/5.6/homestead for details and installation instructions. Use the following commands during installation to get this Homestead-Vagrant-Box:
vagrant box add laravel/homestead --box-version 6.4.0 git clone https://github.com/laravel/homestead.git . git checkout v7.20.0
This Homestead-Version supports PHP 5.6 to 7.3. (More details in german: https://blog.dmr-solutions.com/blog/homestead-vagrant-box-mit-php-56)
Good Luck and regards, Ralf Lütke
Found in teh docs but not tested yet:
try according to "Customizing The SwiftMailer Message"
But I have no idea, how to set the return-path for https://laravel.com/docs/5.5/notifications#sending-notifications, e.g. password reset
Good luck!!! ralf