Newsletters need a link for your clients to follow. Placing the same link in a different place makes it a different link. It is actually much better if you use a different link rather than the same. This way you obtain better click-through and do not spam the email with too many links. The link is how clients follow your call out. Experiment with where you put the link. Make the link easy such as after a segment of information or after bullet points. Watch your click through rates to see which links get more clicks. Based on the position you get more clicks, you should start leaving it there to make it easier to find.