Can You Verify Email Address Validity Using Only PHP?

Verifying Email Address Validity in PHP

Question:

While examining ways to assess email validity, I encountered websites claiming to achieve this task. However, is it feasible to check email validity solely using PHP?

Solution:

To ensure email validity, PHP provides dependable methods. Firstly, let's verify the domain's existence using the domain_exists function:

if(domain_exists($email)) {
    echo('This MX records exists; I will accept this email as valid.');
}
else {
    echo('No MX record exists;  Invalid email.');
}

Additionally, PHP's filter_var function checks if the email has a valid format:

if(filter_var($email, FILTER_VALIDATE_EMAIL)) {
    //Email is valid
}

However, these methods don't guarantee the existence of the user's email on that domain. Here are some considerations to keep in mind:

• Connection Trick: Spammers use this technique to check emails, but some mail servers may prevent it, leading to false positives.
• IP Blacklisting: Verifying too many emails can lead to your server being blacklisted, blocking future email delivery.
• Forced Email Response: The most reliable method is to send an email with a verification link to the specified address. Users must click the link to confirm their email's existence.

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