Yesterday -- Sun, 4/29/18 @ 4:47 PM -- I got an email Twitter notification "Chelsea Clinton's Tweet was featured in the news" -- and then I kept getting that same message from info@twitter.com. Every time I click on "get messages," that is the ONLY email arriving in my inbox. This is blocking ALL my other incoming emails (I use Mozilla Thunderbird for email). I tried Mozilla's suggestion for blocking messages from info@twitter.com, but all that does is shunt the infinitely repeating message to my junk box -- still, no other emails can get through. Now, if I check my email via https://connect.xfinity.com, this "Chelsea Clinton's Tweet" email does NOT reappear. So, is this a Twitter problem? Or has some bad bot hijacked that Twitter message to bedevil Mozilla Thunderbird users? Any help would be appreciated.