Yes, in order to send valid emails you need to use an SMTP relayer like gmail or your ISP. Just sending emails directly from your server will always go to spam or worse, be blocked or rejected.
(I use my ISP: smtp.comcast.net with my Comcast ID.)
You may be able to Google for your ISP or how to use gmail's (or another's) SMTP.
(I use my ISP: smtp.comcast.net with my Comcast ID.)
You may be able to Google for your ISP or how to use gmail's (or another's) SMTP.