Hi @Alaa Amori
Welcome to the community!
By default, Trello is set to email you periodically with notifications you haven't dismissed in the web interface. To receive instant email notifications, go to https://trello.com/my/account and adjust your settings at the top of the page.
Please follow to know more : https://support.atlassian.com/trello/docs/notifications-are-not-working/
Regards,
Sushant Verma
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