More information is needed. Please
take a look at this, then provide more data, in particular
What email client and browser are you using?
What happens if you copy and past a link into the browser?
The more information you provide, the easier it is for others to help you.
If you are using a GUI email client, you might try opening it from the command line, then clicking on a link. There's a chance that a useful error message might appear in the terminal.
