user input validation

How Can You Validate User Input?

There are multiple methods to validate user input in email marketing:
Syntax Checking: Ensures that the email address follows the correct format.
Domain Validation: Confirms that the domain of the email address exists and is reachable.
Real-time Verification: Uses APIs to verify the email address in real-time.
Double Opt-In: Sends a confirmation email to verify the user's email address.

Frequently asked queries:

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How to Handle Invalid User Input?
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