Dotpost uses links in email for different purposes. When you register, a link is sent to verify that it is your email address. You have to click this link to activate your account. If you change your email address within Dotpost, a link will be sent to verify the email address is correct.

In some instances, on particular levels of some browsers, you may receive an error message  ERR_TOO_MANY_REDIRECTS. 
Dotpost is aware of this and working on a permanent resolution.

In the meantime, if you copy the link and paste it into an Incognito window in your browser, it should work.