The reason for why the colour in your signature has changed will be because Outlook have added some extra parameters onto the code that manages the colour.

An example is:

This is the original coding of the website link within outlook:


This is how Outlook (by default changed the colour):

<a href="">

     <span style="colour:#fff">



This is how you should change the colour:

_The code must look like this:_

<a href="" style="colour:#fff">


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