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6.6

mail fails when sending to large volume of recipients

Asked by sid455 in PHP Scripting Language

Tags: php, mail, email, large, sending

hi everybody

i've got a php script that loops through approximately 4500 email addresses in a postgres database and sends a newsletter. i've run a bunch of tests, sending the newsletters to my own email address, and get varying results. sometimes i'll get back 750 emails, other times i'll get back 2500, etc. it never seems to get through all 4500 emails, though. the site is hosted on a free bsd (unix) box. no special components are used to send the email, just mail(). i thought that the mail server itself may be becoming swamped once a certain number of emails get dropped into the outbox, so i tried adding a 2 minute pause (using php's sleep function) once a certain number of email have been sent. i've tried changing the pause to kick in when the script hits 500, 1000, 2000 emails, but still never seem to get through all emails.

anybody have any ideas?

while ($iCount < $iNumRecipients){
$rs = pg_fetch_object($data, $iCount);

// begin sending emails //
if (strstr($sEmailRecipient, '@') != false){ // make sure there's an @ sign in the email address //
      mail($sEmailRecipient, $sSubject, $sStyledEmailBody, $sStyledEmailHeaders);
      }

      // create pause if we're sending a large volume of email //
      if ($iSecondaryCount == 1000){ // we've hit 1000 emails sent - do a pause so we don't overwhelm the mail server //
            sleep(120); // delay for 2 minutes //
            $iSecondaryCount = 0;
      }

$iCount++;
$iSecondaryCount++;
}

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20091111-EE-VQP-89

mail fails when sending to large volume of recipients

Asked by sid455 in PHP Scripting Language

Tags: php, mail, email, large, sending

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