Can you verify email validity only using PHP?

Verifying Email Validity with PHP

You may wonder whether it is possible to verify the validity of an email address using PHP alone. Are not. Unfortunately, with just a single PHP method, you cannot verify (with enough accuracy to trust) that an email actually exists. However, you can still check if an email is formatted correctly using the filter_var method:

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Email hợp lệ
}

Alternatively, you can add another check by extracting export the domain and run the checkdnsrr function:

if (checkdnsrr($domain)) {
    // Miền ít nhất có bản ghi MX, cần thiết để nhận email
}

However, it is important to note that:

• Spamers also know about the "connection trick" (where you start sending an email and rely on the server returning it at that time). Many email servers accept all incoming email, making validation difficult.
• If the accuracy of email address verification is extremely important, the accepted way is to ask users to reply to your email. Send them a complete email with a link they must click to get verified. This is not spamming and you can ensure that any response has a valid address.

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