If you are like us, the only supported protocol for accessing Blesta is via https. To that end, all links sent in emails should have https based links instead of the default http
Here is a quick SQL call to make that happen without having to go into the interface and change each email template manually:
UPDATE `emails` SET `text`=REPLACE(`text`, 'http:', 'https:'), `html`=REPLACE(`html`, 'http:', 'https:')