I have a website where users can place orders for digital items. The website is currently hosted on Google Firebase. When the order is placed, the website communicates with an API script on an Ubuntu server which then sends out an email with an attached text file. However, I am receiving an error as seen in the attachment. I need the error fixed and any other adjustments made so that the email is sent correctly and immediately after an order is placed.
The firebase website is [login to view URL] and the domain of the email script server is [login to view URL] ([login to view URL]). A valid SSL certificate has been installed on the server but the email is not being sent out from the website.
I need this done immediately.