When composing a draft email in Salesforce, users may find the vertical scroll bar is missing. This typically occurs when an email template created in Lightning Experience contains an HTML style attribute that hides overflow content.
<html style="overflow-y: hidden;">
Edit the template and remove: style="overflow-y: hidden;" from the HTML tag to resolve the issue.
This is known to occur when Users Create an Email Template in Lightning Experience. The email template editor in Lightning automatically includes the following HTML and style attribute that causes the behavior:
<html style="overflow-y: hidden;">
<head>
<title></title>
</head>
<body style="height: auto; min-height: auto;"> </body>
</html>
However, on saving the template in Lightning Experience the style="overflow-y: hidden;" attribute is stripped or ignored from the underlying HTML on save.
This default behavior may cause circumstances where the source code for an email template created in Lightning is copied and pasted elsewhere in Salesforce and results in the style attribute persisting in the template's underlying HTML and hiding the scroll bar.
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