I've been getting help for this through curse's customer service, but suddenly I'm no longer receiving replies from them.
I've subscribed to many mods and selected to be notified when the update. I'm not receiving emails when they update though. I'm using Outlook Mail and have added the following to my "safe senders" list:
*@curse.com *@curseforge.com *@twitch.tv
This is frustrating because I'll go to this site and notice more than 20 notifications appearing, but when I click on the notifications page, only 20 will show up, which means I won't know what the rest was.
Yesterday I went to my account in my preferences which lead me to my twitch profile settings. There I changed my email to my gmail account and had it forward email to outlook. I didn't receive an email from gmail or outlook.