Strip port number from autogenerated From: address

FYI: The initial default plugin configuration didn’t work (at least for me). The plugin created a From address from the site URL which was rejected by my email system because the From address included my site’s port number (i.e., wordpress@localhost:8888). (I’m using MAMP and the Postman SMTP plugin going to SendGrid and SendGrid didn’t like that From address). It did like wordpress@localhost, however. So just stripping the port number from the autogenerated From address fixed my problem doing local machine testing. Not sure how often or even if port numbers would show up in a production site. And obviously you should configure a valid From address rather than just using the default one.