My website needs to send some emails to some members and some of these emails are coming back as follow: SMTP error from remote mail server after MAIL FROM:(www@MY_SERVERcom>: host mx.ig.com.br [200.226.132.20]: 553 sorry, your mail was administratively denied. (#5.7.2) What can I do to workaround that? Is something about the email header? This is how I am sending: $mailHeaders = "MIME-Version: 1.0\r\n"; $mailHeaders .= "Content-type: text/html; charset=iso-8859-1\r\n"; $mailHeaders .= "From: \"MY_SERVER.com\" <suporte@xxxxxxxxxxxxx>\r\n\r\n"; $body = nl2br(api_lang_GetKey_("MSG_SEND_CODE_NEW_PROFILE",""))."<br>Link: <a href='".$url."'>$url<a/><BR><BR>\n\n"; $sent = mail( $_POST['EMAIL'], api_lang_GetKey_("MSG_NEW_REGISTER",""), $body, $mailHeaders); PHP Data object relational mapping generator http://www.metastorage.net/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/php-objects/ <*> To unsubscribe from this group, send an email to: php-objects-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/