In some cases, users might have issues receiving Password Reset emails sent from your site via Piano. The links sent from Piano (e.g. www.example.com/reset-password?reset_token=RSTIkINF1qh48jx) are rewritten so that they first go to a Mandrill URL which is used for tracking the open rates. The href in the link differs from what's shown and the emails might not make it to the user's inbox.
There is a way to disable the Mandrill link rewriting. You can add a href attribute to your Identity Management Password reset requests template show Mandrill not to overwrite it as described here.
Once this attribute is applied to the password reset links, Mandrill does not change the link anymore. This will now allow the emails to be received by some email clients as well as no scam warning will be shown when reading the email.