If you have a long list of emails and you’re having difficulty distinguishing among the individual emails in your list, you can select a grid line style to display between each of the emails. This can improve the visibility of each email in your list.

如果电子邮件列表较长，并且难以区分列表中的各个电子邮件，则可以选择网格线样式以在每封电子邮件之间显示。 这样可以提高列表中每封电子邮件的可见性。

To change this setting, first make sure the Mail module is active. If not, click the Mail link at the bottom of the Outlook window. Then, click the View tab.

要更改此设置，请首先确保“邮件”模块处于活动状态。 如果没有，请单击Outlook窗口底部的“邮件”链接。 然后，单击查看选项卡。

Click View Settings in the Current View section of the View tab.

单击视图选项卡的当前视图部分中的视图设置。

On the Advanced View Settings dialog box, click Other Settings.

在“高级视图设置”对话框上，单击“其他设置”。

Select an option from the Grid line style drop-down list in the Grid Lines and Group Headings section of the Other Settings dialog box.

从“其他设置”对话框的“网格线和组标题”部分的“网格线样式”下拉列表中选择一个选项。

NOTE: You can also choose not to separate emails by day by selecting the Show items in Groups check box so there is NO check mark in the box.

注意：您还可以选择不按天分隔电子邮件，方法是选中“显示组中的项目”复选框，以便该框中没有复选标记。

Click OK.

单击确定。

Click OK on the Advanced View Settings dialog box to close it.

单击“高级视图设置”对话框上的“确定”以将其关闭。

Your chosen grid line style should display as separators between each email in your list.

您选择的网格线样式应显示为列表中每封电子邮件之间的分隔符。

Notice that when you select an email, a dotted line displays around the email. That can be another way to distinguish an email from others, as well. If you have the Reading Pane turned off (in the Layout section of the View tab), it does no harm to select an email to call it out in the list.

请注意，当您选择电子邮件时，电子邮件周围会显示一条虚线。 这也可能是区分电子邮件与其他电子邮件的另一种方法。 如果关闭了“阅读窗格”(在“视图”选项卡的“布局”部分中)，则在列表中选择一封电子邮件将其无害。

翻译自: https://www.howtogeek.com/173201/how-to-create-a-clearer-separation-between-each-email-in-your-message-list-in-outlook-2013/