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

Over a certain message of size, it messes up the content when setting through $mail->Body.

You can test it, if it works well with small messages, but doesn't work with larger (over 4-6 kB), then this is the problem.

It seems to be the problem of $mail->Body, so you can get around this by setting the HTML body manually via $mail->MsgHTML($message). And then you can try to only add the non-html body by $mail->AltBody.

Hope that I could help, feel free to provide more details, information.

Answer 2

Interestingly, I had the same exact issue and for me the problem was that my connection was timing out. To be able to see more details on my connections, I added $mail->SMTPDebug = 4; to my phpmailer (look up how to capture the debug since the default output function is echo).

Here's the result:

SMTP -> get_lines(): $data was ""
SMTP -> get_lines(): $str is ""
SMTP -> get_lines(): $data is ""
SMTP -> get_lines(): timed-out (10 seconds)
SMTP -> FROM SERVER:
SMTP -> ERROR: DATA not accepted from server: 

The default timeout is set to 10 seconds. If your app can support more, add this line to your phpmailer:

$mail->Timeout = 20;

Answer 3

In my case in cpanel i have 'Register mail ids' option where i add my email address and after 30 minutes it works fine with simple php mail function.