Fixed the smtp library to send the recipients through the headers rather than the the normal 'to' field, so that the recipients will get different messages, rather than sharing the same one.
Fixed the smtp library to send the recipients through the headers rather than the the normal 'to' field, so that the recipients will get different messages, rather than sharing the same one.

ninsuo/sendgrid-php,admiraalmichiel/sendgrid-php,ninsuo/sendgrid-php,sendgrid/sendgrid-php,matthiaz/sendgrid-php,lucasmezencio/sendgrid-php,taz77/sendgrid-php,taz77/sendgrid-php,admiraalmichiel/sendgrid-php,karlpitcher/MeterReadings,steptan/sendgrid-php,sendgrid/sendgrid-php,matthiaz/sendgrid-php,tonyle/sendgrid-php,karlpitcher/MeterReadings,steptan/sendgrid-php,lucasmezencio/sendgrid-php,tonyle/sendgrid-php