Inside your mailbox, below the block containing all folders you can see how much free space has left. Maximum size of Inbox Mail is 20 Gb.
If a red line appears, you must clean your mailbox. Otherwise there won’t be a possibility to send or recieve messages.
Delete all unnecessary messages from all the folders and at the end – empty trash. If you need a larger mailbox look for more.
In case you did not find your answer contact us