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JETI's default email template (called Default in the template editor) is prepared to render comments into the email body when the "Add comments to outgoing emails" options option is enabled. However, if you develop your own custom email template from scratch or not based on Default, you'll have to add velocity template code to render the comments.

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1. You enable the option "Add comments to outgoing emails" in the corresponding component (Email button, Bulk Email, Post Function, Event Notification)
2. You add a template fragement fragment to your email template  that that will render the comments.

The template fragements fragments are different for HTML and TEXT emails. Copy and paste the below code to your templates or use the Field Picker dropdown and select "Comment".

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#if ($!emailDef.emailOptions.addComments)
<tr valign="top">
    <td style="color:${textColour};font-family:${textFontFamily};font-size:${textSize};padding:0 10px 10px 0;white-space:nowrap;">
        <strong style="font-weight:normal;color:${textSubtleColour};">#text("common.words.comments"):</strong>
    </td>
    <td style="color:${textColour};font-family:${textFontFamily};font-size:${textSize};padding:0 0 10px 0;width:100%;">
        #foreach ($comment in $!publicComments)
        <p style="border-bottom: 1px solid #DDD;">
            <p style="font-weight: bold"><a href="$!baseurl/secure/ViewProfile.jspa?name=$!{comment.author}"><b>$!{comment.authorFullName}</b></a> - <b>$!{dateformatter.format($comment.created)}</b></p>
            <p>$!{rendererManager.getRenderedContent($!commentRendererType, $!comment.body, $issue.issueRenderContext)}</p>
        </p>
        #end
    </td>
</tr>
#end

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Normally comments are rendered by date ascending. To render them the latest on top, you must reverse the list:

#set($publicComments = $!jetiFieldRenderer.reverse($!publicComments))

Last Comment

In operations when the users enter a comment (like issue update, or workflow transitions), the comment they enter can be referred to as $!comment or $!htmlComment depending on the content type of the template.

In other cases, afte after reversing the comment list, you can access the last one easily:

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#if($!publicComments && !$!publicComments.empty)
  #set($lastComment = $!publicComments.get($!publicComments.size()-1))
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#end

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Access All Comments (even restricted ones)

To access all comments of an issue, use the $commentManager object.

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