Undecided... 

Christian Hans

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Vasil, am I right in my assumption then that since I have &quot;&nbsp;*.contoso.com &quot;&nbsp;in the &quot;Do not rewrite the following URLs:&quot; list, I may need to add &quot;&nbsp;*@contoso.com &quot;&nbsp;or just &quot;&nbsp;contoso.com &quot;&nbsp;to that list? <br />
<br />
Thank you Sir.
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Vasil, am I right in my assumption then that since I have " *.contoso.com " in the "Do not rewrite the following URLs:" list, I may need to add " *@contoso.com " or just " contoso.com " to that list?

Thank you Sir.

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We recently turned on O365 ATP and since have started having this problem:<br />
<br />
A very well know HR application service uses this HTML format within the body of the email it sends to users; <br />
<br />
&nbsp; &nbsp; &nbsp;&lt;a href=“mailto:department@co<wbr />ntoso.com”<wbr />&gt;departmen<wbr />t@contoso.<wbr />com&lt;/a&gt;.<br />
<br />
&nbsp; &nbsp; &nbsp;Note: contoso.com being my domain. <br />
<br />
When you click on the email link it takes you to a browser with the following address, which obviously fails to page cant be found: <br />
<br />
&nbsp; &nbsp; &nbsp;<a href="https://nam06.safelinks.protection.outlook.com/?url=%E2%80%9Cmailto:department@contoso.com" rel="ugc">https://nam06.safelinks.protection.outlook.com/?url=%E2%80%9Cmailto:department@contoso.com</a>&quot;&amp;data=yadayadayada<br />
<br />
When I hover over the email address link it shows this in Outlook: <br />
<br />
&nbsp; &nbsp; &nbsp;Original URL<br />
&nbsp; &nbsp; &nbsp;?mailto:department@contoso<wbr />.com?<br />
&nbsp; &nbsp; &nbsp;Click or tap to follow link. <br />
<br />
<br />
What piece of ATP could be causing this?
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We recently turned on O365 ATP and since have started having this problem:

A very well know HR application service uses this HTML format within the body of the email it sends to users; 

     <a href=“mailto:department@contoso.com”>department@contoso.com</a>.

     Note: contoso.com being my domain. 

When you click on the email link it takes you to a browser with the following address, which obviously fails to page cant be found: 

     https://nam06.safelinks.protection.outlook.com/?url=%E2%80%9Cmailto:department@contoso.com"&data=yadayadayada

When I hover over the email address link it shows this in Outlook: 

     Original URL
     ?mailto:department@contoso.com?
     Click or tap to follow link. 


What piece of ATP could be causing this?

ATP breaking mailto: function

Advanced Threat Protection

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.

HTML

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