So i was doing some maintenance on my Instagram and Twitter accounts checking to make sure all my OG emails are working so I dont lose any accounts to a PW reset or some stupid email verification and I realized that a few of my email accounts were not receiving any emails because they were inactive.
So I did a little google searching and here is a list of all the time periods before your email account goes inactive.
Gmail - 270 days
Yahoo - 360 days
Outlook - 365 days
AOL - 180 days
icloud - Never
GMX - 180 days
Mail.com - 180 days
Mail.ru - 180 days
Rediffmail - After 2 months messages are wiped and after 3 months account is purged (I just opened up multiple rediffmail accounts that havent been logged in to in over 4 months and they were fine)
Please add any emails or updated corrections you find.
EDIT* Here's a Guide to avoid this.