sendgrid-php

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Can someone exmplain me how that substitution_tag works? ``` $email = new Mail(); $email->setClickTracking(true, true); $email->setOpenTracking(true, "--sub--"); $email->setSubscriptionTracking( true, "subscribe", "subscribe", "%%sub%%" ); $email->setSubject("Sending with Twilio SendGrid is Fun 2");...

milanIntermaps