Margin and padding in Classic Outlook email signatures
Spacing that looks natural in a browser can shift in Classic Outlook. When a compact signature depends on exact alignment between a logo, name and contact details, small spacing changes can be visually obvious.
What Microsoft documents
Microsoft’s current rendering guidance says Classic Outlook can render standard CSS margins and padding inconsistently. For table-based email layouts, Microsoft recommends applying spacing to table cells where possible.
Pattern SigLint checks
<div style="margin-top:12px">Phone: +45 …</div>SigLint flags margin declarations and reports every occurrence with a line/column location. The rule is Medium severity because the effect is often a spacing difference rather than total content loss.
Safer direction
<table role="presentation" cellpadding="0" cellspacing="0">
<tr>
<td style="padding-top:12px">Phone: +45 …</td>
</tr>
</table>For critical signature layout, keep structure simple and place essential spacing on table cells. Then re-run the checker and test the installed signature in Classic Outlook.