Smtp Server Response: 530 5.7.0 Must Issue a Starttls Command First

SMTP server response: 530 5.7.0 Must issue a STARTTLS command first

First, make sure you PHP installation has SSL support (look for an "openssl" section in the output from phpinfo()).

You can set the following settings in your PHP.ini:

ini_set("SMTP","ssl://smtp.gmail.com");
ini_set("smtp_port","465");

How solve this error ( mail(): SMTP server response: 530 5.7.0 Must issue a STARTTLS command first. i2sm7399406pjt.19 - gsmtp )

You're working with SSL so, check your PHP installation to make sure you can use that protocol, check if your PHP supports it.

If it does, try changing your .env, changing the line MAIL_HOST=smtp.googlemail.com to MAIL_HOST=smtp.gmail.com.

If this doesn't solve your problem, try modifying SMTP=ssl in your php.ini to SMTP=ssl://smtp.gmail.com.

SMTP ERROR: MAIL FROM command failed: 530 5.7.0 Must issue a STARTTLS command first when using PHPMailer

To be fair, your script is doing exactly what you're asking it to, but gmail doesn't like that!

Your problems stem from this line:

$mail->Host = gethostbyname('smtp.gmail.com');

This will set Host to an IP address, and it has been suggested in the past as a workaround for those using IPv6 (which gmail doesn't like), because it always returns an IPv4 address.

However, it causes another problem: there is no longer a host name to verify a certificate against, and TLS connections fail. So this leads you try to turn off TLS:

$mail->SMTPAutoTLS = false;
$mail->SMTPSecure = false;

Having no TLS means you can't authenticate, so you turn that off:

$mail->SMTPAuth = false;

But gmail (very sensibly) won't let you send without authentication, and so you're stuck.

The solution then is to undo all that, revert to the code as provided in the gmail example.

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