Sure, for example this is the source code of the email that doesn't display the images:
in all cases where I have a working link, I actually overrode them in the template
Here is the email source - notice the indirect image sources:
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><style type="text/css">.emoji[data-set-id="emoji-one"]{vertical-align:middle;height:20px;width:20px}</style>
<p>
<a href="http://dash/board/user/Lucas"><img style="vertical-align: middle; width: 24px; height: 24px; padding-right: 1em;" src="" title="Lucas"></a>
<a href="http://dash/board/user/Lucas">Lucas</a> has posted a new topic called "<a href="http://dash/board/topic/15/updated-latest-news">Updated latest news</a>" in "<a href="http://dash/board/category/2/dcl">DCL</a>":
</p>
<blockquote><p>
⢠We probably need .....<br>
⢠No change.... <br>
⢠I assume ....</p>
<p><img src="/nodebb/uploads/files/1478707630983-upload-606926c6-a083-4817-81c5-bf6732159c6d.png" alt="0_1478707659844_upload-606926c6-a083-4817-81c5-bf6732159c6d" class="img-responsive img-markdown"></p>
<p><img src="/nodebb/uploads/files/1478707646862-upload-26466cf8-c236-4440-acc7-e80b98f8da05-resized.png" alt="0_1478707675336_upload-26466cf8-c236-4440-acc7-e80b98f8da05" class="img-responsive img-markdown"></p>
</blockquote>
<a href="http://dash/board/topic/15/updated-latest-news">Click here to view the topic</a>
and here is the template I edited myself - notice the manual overrides to at least make some of the links work:
<p>
<a href="http://dash/board/user/{user.slug}"><img style="vertical-align: middle; width: 24px; height: 24px; padding-right: 1em;" src="{user.picture}" title="{user.name}" /></a>
<a href="http://dash/board/user/{user.slug}">{user.name}</a> has posted a new topic called "<a href="http://dash/board/topic/{topicSlug}">{title}</a>" in "<a href="http://dash/board/category/{category.slug}">{category.name}</a>":
</p>
<blockquote>{content}</blockquote>
<a href="http://dash/board/topic/{topicSlug}">Click here to view the topic</a>