Short answer:
Email clients often apply default blue styling to links. Override this by setting your own color and removing underlines directly in the HTML source.
Many email clients automatically apply a blue color and underline to email addresses and web links.
In Outlook, this styling may only appear after the email is sent.
If this does not match your corporate style guide, you can override the styling using either the built-in designer or by editing the HTML source.
HTML Pro: How to style email links in the HTML source
<a href="mailto:((Email))"> <font face="Arial, Helvetica, Sans-Serif" color="#000000" style="FONT-SIZE: 10pt"> ((Email)) </font> </a>
Without underline:
<a href="mailto:((Email))" style="text-decoration: none;"> <font face="Arial, Helvetica, Sans-Serif" color="#000000" style="FONT-SIZE: 10pt"> ((Email)) </font> </a>
HTML Pro: How to style web links in the HTML source
<a href="http://www.xink.io"> <font face="Arial, Helvetica, Sans-Serif" color="#000000" style="FONT-SIZE: 10pt"> www.xink.io </font> </a>
Without underline:
<a href="http://www.xink.io" style="text-decoration: none;"> <font face="Arial, Helvetica, Sans-Serif" color="#000000" style="FONT-SIZE: 10pt"> www.xink.io </font> </a>
