Yep, if you&#x27;re using the SMTP API, see <a href="https:&#x2F;&#x2F;sendgrid.com&#x2F;docs&#x2F;API_Reference&#x2F;SMTP_API&#x2F;substitution_tags.html" rel="nofollow">https:&#x2F;&#x2F;sendgrid.com&#x2F;docs&#x2F;API_Reference&#x2F;SMTP_API&#x2F;substitutio...</a>.<p>If you&#x27;re using a wrapper like sendgrid-ruby (<a href="https:&#x2F;&#x2F;github.com&#x2F;sendgrid&#x2F;sendgrid-ruby" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;sendgrid&#x2F;sendgrid-ruby</a>), check out its documentation page on GitHub. For instance, here&#x27;s how to use substitution tags in Ruby: <a href="https:&#x2F;&#x2F;github.com&#x2F;sendgrid&#x2F;sendgrid-ruby#working-with-templates" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;sendgrid&#x2F;sendgrid-ruby#working-with-templ...</a>