Apparently, I recently learned that Microsoft email accounts (Live.com, Hotmail.com, Outlook.com) were blocking Livejournal emails from going to said email accounts' inboxes. This was done due to issues relating to spam. I believe this got fixed now because
torfindra got an email from Livejournal yesterday.
Hopefully Microsoft and Livejournal can work all this out so this won't happen again in the future.