The case comment notifications and Portal password reset emails are send through Salesforce.
  1. Check your junk or spam folder for the email.
  2. Have your IT department ensure the Salesforce IP addresses are allowed into your email server. 

Note: We provide links to third-party websites in an effort to help you resolve your issue. We are not responsible for the information on third-party websites, and we cannot assist with implementing the resolution from these websites.