To whitelist GlowHost in your Gmail account, please use the following steps:
1) Login to your Gmail Account
2) Click on the Settings Icon and select "Settings" from the drop down menu.
3) Go to the Filters tab, and click "Create a new filter"
4) In the window that appears, type @glowhost.com in the "From:" field like in the example below:
5) Click "Create filter with this search"
6) On the next window that appears, select "never send it to spam" along with any other options you wish to have.
7) Click "Create Filter" and you should be all set!