Gmail Schema Actions succeed using Gmail Scripts but not when sent with Mailgun

Issue: Schema-enabled Gmail emails are delivered successfully via Gmail Scripts yet fail to display proper actions when sent through Mailgun. DKIM appears intact, but formatting differences may be responsible.

function sendSchemaEmail() {
  const schemaDetails = { actionType: 'confirm', category: 'trial' };
  mailClient.dispatch({
    sender: '[email protected]',
    recipient: '[email protected]',
    subject: 'Test Schema Email via Script',
    htmlContent: `<div data-action='${JSON.stringify(schemaDetails)}'>Click Here</div>`
  });
}
function executeMailgunDispatch() {
  const verifyDetails = { trigger: 'verify', note: 'notification' };
  mailTransport.send({
    from: '[email protected]',
    to: '[email protected]',
    subject: 'Test Schema Email via Mailgun',
    html: `<section data-trigger='${JSON.stringify(verifyDetails)}'>Tap Here</section>`
  });
}

hey, seems mailgun might be reformatin ur html, causing data attr changes. try checking if it strips out or modifies quotes or spaces in the schema code. maybe encode the content differently to keep the schema intact.

Based on my own troubleshooting, Mailgun seems to modify the HTML structure of the email message, which interferes with the proper recognition of the schema markup. I encountered a similar issue where using inline encoded JSON for data attributes helped in preserving the structure when going through Mailgun. Experimenting with different encoding techniques and ensuring the HTML remains as unaltered as possible has made a significant difference. It might also be worth reviewing Mailgun’s HTML handling options to see if disabling any optimizations could help maintain the integrity of the schema details.

I encountered a similar challenge when switching email providers, and it turned out that the issue was not with the schema itself but with how the service processed the HTML markup. In my case, the provider automatically inserted additional wrappers and tracking elements, which changed the underlying structure of the email. I resolved it by carefully reviewing the final HTML output and ensuring that I used a minimalistic, raw payload to prevent unwanted modifications. Examining the email’s MIME structure and content-type settings also helped me pinpoint where the alteration was occurring and adjust my approach accordingly.

hey, might wanna try sending a raw html to avoid mailgun auto format issues. sometimes they tweak code behind the scenes, messing up your schema details. also check content-type so your data attr ain’t altered.

The challenge with Mailgun appears to be subtle and relates to how its system processes HTML content rather than an outright flaw in schema syntax. In my own testing, I found that even minor reformatting by the platform can disrupt the integrity of data attributes required for schema actions. Adjustments like explicitly defining the content-type header to text/html and carefully verifying the final delivered HTML output helped. It seems that a lean, unmodified HTML payload may mitigate these issues, ensuring that schema markers remain intact throughout transit.