A more advanced form of spamming called phishing involves unsolicited emails appearing to come from trusted sources. For example, someone who is phishing will send users mails that appear to be from banks, shopping sites and payment services. The spammers will point out to the user the urgency needed for the users to take toward their account to coheres them to open the email. Phishing often involves ways for the spammers to steal the identity of the user through the user entering information such as their credit card or social security number. 

When entering a clickable URL address inside your html message, instead of a hypertext link, you are allowing subscribers to see the email address you enter. If Adopia's click tracking feature is turned on users maybe sent to another link instead of going to straight to the link that leads to the information they have specifically requested. Email Service Providers may look at this content and think something suspicious is going on when you have a link meant to go somewhere specific going somewhere else. Consequently, your message may end up in the junk folder. Using a hypertext link avoids this issue, as a hyperlink goes straight to the information a user specifically asks for.