phpmailer - The following SMTP Error: Data not accepted

Question

I\'m trying to figure out this issue for 6 hours. But there is nothing to make sense. Here is the scenario; There is a well formatted HTML template.

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Answer 1

For AWS users who work with Amazon SES in conjunction with PHPMailer, this error also appears when your "from" mail sender isn't a verified sender.

To add a verified sender:

1. Log in to your Amazon AWS console: https://console.aws.amazon.com

2. Select "Amazon SES" from your list of available AWS applications

3. Select, under "Verified Senders", the "Email Addresses" --> "Verify a new email address"

4. Navigate to that new sender's email, click the confirmation e-mail's link.

And you're all set.

Answer 2

I was hitting this error with phpMailer + Amazon SES. The phpMailer error is not very descriptive:

2: message: SERVER -> CLIENT: 554 Transaction failed: Expected ';', got "\"
1: message: 
2: message: SMTP Error: data not accepted.

For me the issue was simply that I had the following as content type:

$phpmailer->ContentType = 'text/html; charset=utf-8\r\n';

But that it shouldn't have the linebreak in it:

$phpmailer->ContentType = 'text/html; charset=utf-8';

... I suspect this was legacy code from our older version. So basically, triple check every $phpmailer setting you're adding - the smallest detail counts.

Answer 3

In my case the problem was with the content of mail. When I changed content to simpler content without HTML, it worked. But after updating the phpmailer everything solved.

Answer 4

set phpmailer to work in debug to see the "real" error behind the generic message 'SMTP Error: data not accepted' in our case the text in the message was triggering the smtp server spam filter.

  $email->SMTPDebug = true;

Answer 5

We send email via the Gmail SMTP servers, and we get this exact error from PHPMailer sometimes when we hit our Gmail send limits.

You can check if it's the same thing happening to you by going into Gmail and trying to manually send an email. In our case that displays the more helpful error message about sending limits.

https://support.google.com/a/answer/166852?hl=en

Answer 6

I was using just

$mail->Body    = $message;

and for some sumbited forms the PHP was returning the error:

SMTP Error: data not accepted.SMTP server error: DATA END command failed Detail: This message was classified as SPAM and may not be delivered SMTP code: 550

I got it fixed adding this code after $mail->Body=$message :

$mail->MsgHTML = $message;
$mail->AltBody = $message;