How to make SUBJECT Substitutions in Sendgrid Swift SmtpTransport?

Question

I am using Swift SmtpTransport as it seems to be the recommended way.

However the documentation I found dos not show how to achieve Subject Substitutions.

• (This is what I am using) https://github.com/sendgrid/sendgrid-php-example/blob/master/smtp-php-example.php
• https://github.com/sendgrid/sendgrid-php
• http://swiftmailer.org/docs/sending.html#quick-reference-for-sending-a-message

Answer 1

This was answered on Github, answering here too, for folks future reference.

To use the SMTPAPI to substitute for subjects, you'll need substitution tags in the subject of the email and then include the x-smtpapi header with substitution tags defined.

Using the SendGrid SMTPAPI Library:

<?php
...
$message->setSubject('[sendgrid-php-example] Owl named %yourname%');
$header           = new Smtpapi\Header();
$header->addSubstitution("%yourname%", array("Mr. Owl"))->
...