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smtp error

I am getting this error after submiting form. Any idea what is wrong?
Warning: mail() [function.mail]: SMTP server response: 451 See http://pobox.com/~djb/docs/smtplf.html. in D:\Hosting\2424358\html\nthsclassof87.com\formmail.php on line 452
The following errors were found:

* Message could not be sent due to an error while trying to send the mail.

PHPFormMail has experienced errors that must be fixed by the webmaster. Mail will NOT be sent until these issues are resolved. Once these issues are resolved, you will have to resubmit your form to PHPFormMail for the mail to be sent.

‹ spam through contact form body text no longer being sent ›
By dukester999 on

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Your SMTP server is

Your SMTP server is recjecting the email for some reason.  You'll need to contact your hosting provider.
Posted by Andrew M Riley on Sat, 04/04/2009 - 15:34.

Your hosting provider is

Your hosting provider is using Qmail as a MUA and is validly rejecting the formmail.php output. Qmail is quite strict on adherence to the RFC standard for mail mail servers whice prohibit the use of lines ending in a single LF (linefeed) character.
Luckily you can change this behaviour by adding a hidden field in your calling page to change mail_newline from the value of 1 to 2 or 3.
http://developerkarma.com/phpformmail-readme-all-one-version#mail_newline is what you need to read. Select value 2 or 3 instead of the default 1.
..Petar

Posted by Anonymous on Fri, 05/29/2009 - 04:46.