Has Gmail stopped working for SER?

My Gmail address suddenly stopped working in SER since the update where SER puts characters in the email address to increase email range. I also got an email from Google saying they detected suspicious activity. I clicked yes for "was this you?", but since then SER doesn't take my email address. I only use the one btw, I'm not sure if that was the problem though. On a similar note, which is the best email for SER? I've heard Hotmail, do those work well?

it happens when you have private proxies with subnets from different countries . One time you logged in via netherlands , 900 seconds later you connect via las vegas . It is fishy . it happens to me a lot , at the start of each month when I get new proxies  ,I have to login in 50-60 accounts to get that WEB AUTH error removed  (gmail answer = 78754) google it .

Also it could be due to the fact that you have 10k mails daily in your inbox .