Spam junk campaign

I have a site threw HostGator ssl encrypted there email comes up standard stl encryption. I set up PHP list did a campaign it keeps going to junk mail or spam, any settings that could effect this

@Valmerin Ensure that SPF and DKIM are set-up. Also, test with several email providers - Yahoo, gmail, Microsoft etc.

We also use Hostgator for our web sites. I made sure to properly register the outbound domain and to add the DKIM plugin to the phpList installation. It all works great now.