A common misconception is to place the unsubscription link to the bottom of the email and style it with a very small font-size, so small that your recipients can not notice it at the first.
This is really dangerous. Making your unsubscription link (the link which lets your recipient to go away from your service) invisible or difficult to notice will push your recipient to click on “Report as SPAM” button on the email client. This means your mail servers and domain will be banned, black listed. This means $$$ to waste on monitoring your mail servers and domain against spam filters.
Instead, make your unsubscription link noticable by your recipients. Put it on the top and bottom. Make it bigger. In this way, you can let your recipients who are not interested in your services to go away from you. Just focus on loyal subscribers let the others go. Give them freedom. Believe it or not, your unsubscription rate and spam complaint rate will decrease.
In your Sendloop campaigns, you can insert unsubscription link tag to anywhere you want. You can style it based on your newsletter layout design and make it even more noticeable. To help you at this point, we verify every outgoing campaign against properly inserted unsubscription links and provide suggestions to make your newsletter more recipient friendly.