Why am I receiving these emails below continueously?

I have unlimited data then why these

This is an auto-generated message, please do not respond.
Your mailbox size has reached 964.62MB, which is over 90% of your 1000.00MB quota.
Please delete some messages to avoid exceeding your quota.
Please be advised that it may be necessary to log into webmail.shaw.ca if your email client is not set up to delete messages from the server.

For additional support to help cleanup your mailbox please visit the following
Shaw Communities Website

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