You’ll either have to buy some extra storage space from Google or another solution is that you find all the emails in your Inbox that have really big attachments and put them into the trash.
Sorting your Gmail Messages by Size
Gmail doesn’t offer a way to search and sort email messages by size but you can use a tool like Microsoft Outlook or IMAP Size to sort your mails by the size criteria on the desktop. They connect to your Gmail account via IMAP and therefore when you delete an emails with big attachments locally, the same happens in your online inbox as well.
If you however find the above workarounds a little complicated, there’s an even simpler method now that won’t even require you download or install anything – it’s called findbigmail.com.
It will quickly find all the big email messages in your Gmail account that are taking up the maximum space. These messages are categorized with special labels like “Big Mail” or “Really Big Mail” to help you decide which of them should be removed to recover more space. Leer más “Locate all the Big Emails in your Gmail Account”