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/* Changing the layout to use less space for mobiles */
@media screen and (max-device-width: 480px), screen and (-webkit-min-device-pixel-ratio: 2) {
    #email-body { min-width: 30em !important; }
    #email-page { padding: 8px !important; }
    #email-banner { padding: 8px 8px 0 8px !important; }
    #email-avatar { margin: 1px 8px 8px 0 !important; padding: 0 !important; }
    #email-fields { padding: 0 8px 8px 8px !important; }
    #email-gutter { width: 0 !important; }
}
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<div id="email-body">
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                                        <img id="email-avatar" src="https://issues.shibboleth.net/jira/secure/useravatar?ownerId=ian%40iay.org.uk&avatarId=10125" alt="" height="48" width="48" border="0" align="left" style="padding:0;margin: 0 16px 16px 0;" />
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                                    <a class="user-hover" rel="ian@iay.org.uk" id="email_ian@iay.org.uk" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=ian%40iay.org.uk" style="color:#326ca6;">Ian Young</a>
     commented on <img src="https://issues.shibboleth.net/jira/images/icons/issuetypes/bug.png" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#326ca6;text-decoration:none;' href='https://issues.shibboleth.net/jira/browse/SIDP-598'>SIDP-598</a>
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                <a style='color:#326ca6;text-decoration:none;' href='https://issues.shibboleth.net/jira/browse/SIDP-598'><strong>encoding problem in IdP backup metadata file</strong></a>
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        <div class="comment-block" style="background-color:#edf5ff;border:1px solid #dddddd;color:#000000;padding:12px;"><p>I think this <b>was</b> a problem in the IdP (as Rod says, strictly in java-opensaml) but that it has long been fixed, albeit unintentionally.</p>

<p>The system on which this is reported to fail was IdP 2.1.5. Tracing the dependencies, this uses shibboleth-common 1.1.4 and opensaml 2.3.1 (rev 1428).</p>

<p>The next version of the IdP (2.2.0) used shibboleth-common and opensaml 2.4.0 (rev 1484).</p>

<p>Between rev 1428 and rev 1484, FileBackedHTTPMetadataProvider was essentially rewritten. In particular, the older version wrote the backup file by serialising the loaded XMLObject into a default FileWriter. This would have used the default character encoding, which on a Linux system would almost certainly be a one-byte character encoding like US-ASCII. However, that US-ASCII text was accompanied by the following XML declaration (from the reporter's sample):</p>

<p>   &lt;?xml version="1.0" encoding="UTF-8"?&gt;</p>

<p>This would cause the failure we're seeing.</p>

<p>The later version of FileBackedHTTPMetadataProvider instead operates on the basis of an array of bytes being read from or written to a Stream connected to the backup file. So, by definition, what goes out comes back in.</p>

<p>I'd therefore expect that it would not be possible to reproduce this on any version of the IdP from 2.2.0 onwards. I'm therefore going to mark this RESOLVED FIXED in that release. Reopen this issue if it can be reproduced on a non-EOL version of the IdP.</p>
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