You should be able to via the custom SMTP service. It shouldn't even require a plugin.
Help - Configuring Apache v2.2.15 as a reverse proxy to NodeBB
So far I have installed and configured nodebb successfully and it is running on port 4567.
But I am struck with the last step which is configuring web server as proxy. My server is running on CentOS 6.8 and I am struck with Apache 2.2.15 . I can see that I need to follow below procedure .
The problem is I am very new to linux and couldn't understand the steps mentioned there. Searched online but couldn't find any article with detailed steps.
Can some one who did this already help me with steps / instructions. Thanks in advance.