A very simple way to validate a string of text in C# as an e-mail address using the RFC5322 specification.

Excel Email Validation

Validate email addresses in a Microsoft Excel spreadsheet with Data Validation. You can prevent people from entering invalid email addresses and check for and remove invalid email addresses that may already exist. It’s a simple custom formula.

You can find the formula here: https://syntaxbytetutorials.com/excel-email-validation-with-data-validation-tools/
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