Hi @Ecostainable,

Thanks for sharing this with the community.

This could be one of a few things...including but not limited to, an issue of invalid syntax that was mistakenly saved to your email template before sending or an SMTP error.

I recommend reaching out to our support team to dig into this specific issue further and verify the cause.

Please provide a link to the campaign and/or the campaign name in your message to support along with a screenshot of the error.

Thanks for being a member of our community.