Several times users have to deal with , if you are facing the issue then check for the account storage. If you send and receive a lot of emails on Google Drive or Photos then it’s likely that your account storage is full. Gmail provides with 15GB of free storage that is shared across Google Photos, Google Drive, and Google. Once the storage is full then you won’t be able to send or receive the emails. So, if you are encountering with such an issue then you need to check the account storage and if it is not free then keep some space free to deal with the issue.