发送未经身份验证的SMTP电子邮件

Question

My webhost does not allow mail accounts to be created. However they have provided me with their SMTP gateway and said no credentials are needed when the mails are being sent from their datacenter.

$mail->isSMTP();
$mail->SMTPDebug    = 2;
$mail->Host         = GATEWAY_PROVIDED_BY_HOST
$mail->SMTPAuth     = false;
$mail->SMTPSecure   = false;

Invalid address: (From): root@localhost

It seems I need to add a from address. But in the case that they do not allow a mail account to be created, what do I put in the from address?

Answer 1

Try to use a valid sender "from" email address.

Update: You have to use a sender address which is the mail server responsible for (or a white listed one). normal "@domain.tld" is enought. the name in front of the at is often not tested.

Also possible: you can only send "to" the domain which is the mail server responsible for or you have to authenticate. best is you contact your server provider.

Answer 2

You need to set a From address:

$mail->setFrom('user@example.com', 'My Name');

This will set the from address that appears in message headers, but it will also used as the MAIL FROM command at the SMTP level (where your error is coming from) as it's automatically copied to the Sender PHPMailer property which applies there. That will avoid the fallback to the root@localhost address you're getting.

The other things you're doing to disable authentication are correct.

Answer 3

Create a Google Account and use it:

$mail->IsSMTP();
$mail->SMTPAuth = true;
$mail->Username = "your@gmail.com";
$mail->Password = "*****";
$mail->SMTPSecure = "ssl";  
$mail->Host = "smtp.gmail.com";
$mail->Port = "465";
$mail->setFrom('your@gmail.com', 'Your Name');
$mail->addReplyTo('your@gmail.com', 'Your Name');