Auto Send Email based on Cell Content

I am trying to get an email to automatically be produced and sent if Cell in Column U contains the words "Send Reminder"

I have attached the spreadsheet and the code I have been working on [from Ron Bruin site]for the email which I cannot get working

Also not convinced it would send automatically when the cell changes to contain required phrase

I'd be really grateful for some help with explaining what I have done wrong

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Spreadsheet is here: Contacts List.xlsm

Thank you so much for helping