Update 3: Google claims the issue with Gmail is resolved.
- (2:31PM PST 11/25) "The problem with Gmail should be resolved. We apologize for the inconvenience and thank you for your patience and continued support. Please rest assured that system reliability is a top priority at Google, and we are making continuous improvements to make our systems better."
Update 2: The issues appear to be resolving.
Update: Google has marked Gmail as experiencing a service disruption currently: