When creating a ticket by email that includes a wide table, the table gets truncated with no horizontal scrolling available, making some columns invisible.

Till the issue is resolved, you can do the following as a workaround:

1. Create a custom CSS
2. Add the following style in the CSS

div.richtext-content {
	overflow: scroll;
}

Checkout this article for instructions in adding a custom CSS:

https://medium.com/@ANotDevDev/how-to-add-custom-css-to-zammad-4cff81a9197e