Some tell us that  Gmail is particularly slow, while others are getting constant error messages. Emails he was sending to Gmail accounts appeared to immediately bounce, with Gmail's server responding with an error reading "550-5.1.1 The email account that you tried to reach does not exist."

Google has admitted it is having a few problems which are  impacting a "significant" number of users: "We're aware of a problem with Gmail affecting a significant subset of users. The affected users are able to access Gmail, but are seeing error messages, high latency, and/or other unexpected behavior."

Google now says the problems have been resolved, although encrypted email service ProtonMail tweets that the email bouncing issue is widespread, with many emails sent to Gmail users bouncing permanently.