PHP Email client which can be easily intergrated to Laravel

Asked by: Vlad Reshetilo

I need to make crm system, and it's needed (don't ask why) to have built-in email client like this (picture below)

I need the next properties:

1. php7 compability
2. possibility to integrate it to Laravel framework
3. Free, open-source

Maybe someone know such project? Thanks a lot.

Source