出于某种原因，当我为表格中的单元格设置宽度时，它不会影响单元格的宽度。仅供参考，我正在为邮件程序使用内联样式。
<table cellpadding="0" cellspacing="0" width="100%">
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<td align="center">
<table cellpadding="0" cellspacing="0" width="550" style="width: 100%; max-width: 550px; text-align: center; border: 1px solid #003a4b;">
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<td style="padding-top: 10px;"><span style="font-family: helvetica, sans-serif; font-size: 37px; font-weight: bold; color: #93d600; border-bottom: 1px solid #003a4b;">Hunters Conference 2017</span></td>
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<td width="80%" style="padding: 20px 0; background-color: blue;"><span style="font-family: helvetica, sans-serif; font-size: 16px; color: #003a4b; background-color: red;">Fyber were honoured to attend and support such a fantastic conference, congratulations to everyone that won a prize on our wheel of fortune!</span></td>
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<td width="80%" style="padding: 0 55px; padding-bottom: 20px;"><span style="font-family: helvetica, sans-serif; font-size: 16px; color: #003a4b;">We hope you all had a great day, we enjoyed catching up with everyone and it was nice to see our clients face to face. </span></td>
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<td style="padding-bottom: 20px;">
<img src="https://gallery.mailchimp.com/b083c967cd22e35ab4ce75e7a/images/2c3e3b5e-9a9f-4864-a36f-6359b0dd4b75.jpg" alt="Spinning Wheel" width="550" style="width: 100%; max-width: 550px;">
</td>
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<![endif]-->
<!--[if !mso]><!-- -->
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<td style="padding-bottom: 20px;">
<img src="https://gallery.mailchimp.com/b083c967cd22e35ab4ce75e7a/images/19e810cd-df47-474b-aa47-3f33bf26922a.gif" alt="Spinning Wheel" width="550" style="width: 100%; max-width: 550px;">
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td 的默认行为是填充表格的宽度，因此如果<td>每行只有一个<tr>，则无论您做什么，它都会始终占据表格的整个宽度。一种方法是在该 td 内创建一个表格，并将宽度放在表格上。此外，在电子邮件中向左和向右填充不起作用，因此创建具有定义宽度的表格并将它们居中是最好的选择。
另一种方法是在左侧和右侧放置间隔单元，为您提供填充空间。我按照第一种方法修改了您的代码（只是带有蓝色/红色和白色背景的文本单元格）。
请注意：我没有修复你的所有代码，只是改变了一些让你开始
<table cellpadding="0" cellspacing="0" width="100%">
<tr>
<td align="center">
<table cellpadding="0" cellspacing="0" width="550" style="width: 100%; max-width: 550px; text-align: center; border: 1px solid #003a4b;">
<tr>
<td style="padding-top: 10px;"><span style="font-family: helvetica, sans-serif; font-size: 37px; font-weight: bold; color: #93d600; border-bottom: 1px solid #003a4b;">Hunters Conference 2017</span></td>
</tr>
<tr>
<td align="center" style="padding: 20px 0; background-color: blue;">
<table border="0" cellpadding="0" cellspacing="0" style="width:80%;">
<tr>
<td align="left"><span style="font-family: helvetica, sans-serif; font-size: 16px; color: #003a4b; background-color: red;">Fyber were honoured to attend and support such a fantastic conference, congratulations to everyone that won a prize on our wheel of fortune!</span></td>
</tr>
</table>
</td>
</tr>
<tr>
<td align="center" style="padding: 20px 0;">
<table border="0" cellpadding="0" cellspacing="0" style="width:80%;">
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<td align="left"><span style="font-family: helvetica, sans-serif; font-size: 16px; color: #003a4b;">We hope you all had a great day, we enjoyed catching up with everyone and it was nice to see our clients face to face. </span></td>
</tr>
</table>
</td>
</tr>
<!--[if mso]>
<tr>
<td style="padding-bottom: 20px;">
<img src="https://gallery.mailchimp.com/b083c967cd22e35ab4ce75e7a/images/2c3e3b5e-9a9f-4864-a36f-6359b0dd4b75.jpg" alt="Spinning Wheel" width="550" style="width: 100%; max-width: 550px;">
</td>
</tr>
<![endif]-->
<!--[if !mso]><!-- -->
<tr>
<td style="padding-bottom: 20px;">
<img src="https://gallery.mailchimp.com/b083c967cd22e35ab4ce75e7a/images/19e810cd-df47-474b-aa47-3f33bf26922a.gif" alt="Spinning Wheel" width="550" style="width: 100%; max-width: 550px;">
</td>
</tr>
<!--<![endif]-->
</table>
</td>
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