php - SMTP Error: Could not connect to SMTP host when using other server instead of SMTP -

i working in php. have wriiten mail functionality using mailer extension of yii framework code as-

public function sendsecureemail($fromemail,$toemail,$subject,$message)     {         $settings=new settings();         $mailer = yii::createcomponent('application.extensions.mailer.emailer');         $mailer->issmtp();         $mailer->ishtml(true);         $mailer->smtpauth = true;         $mailer->smtpsecure = 'ssl';         $mailer->host =$settings->host;         $mailer->port =$settings->port;         $mailer->charset = 'utf-8';         $mailer->username =$fromemail;          $mailer->password =$settings->password;         $mailer->fromname = 'balaee.com';     //  $mailer->addaddress($toemail);         $mailer->subject = $subject;         $mailer->ishtml(true);         $mailer->body=$message;         $mailer->addcc($toemail);     //  $mailer->addbcc=;         if($mailer->send())         {             echo "mail send successfully.please have check mail ";         }         else         {             echo "fail send message!";         }     } 

where $setting->$host="mail.balaee.com",$setting->$port=25. in php.ini file settings as-

smtp = mail.balaee.com sendmail_from = noreply@balaee.com smtp_port = 25 

when trying send mail giving me error as-smtp error: not connect smtp host. addtional settings needed do

i had similar error. turned out dns settings went blank in centos after server restarted. after setting them stared working again. hope helps.