The customer portal login details were not delivered to my customers. What is the issue?

The portal login details are sent through emails.

Emails are not delivered to a contact in the following two cases:

1. Support start date and end date of the contact are invalid

1. Click the Main Menu.
2. Go to the Essentials tab.
3. Select Contacts.
4. Open the contact to whom you must send the portal login details.
5. Enable the Portal User field.
6. Look for the Support Start Date and Support End Date fields.
7. Enter valid dates.

2. Email delivery is not set up correctly

1. Click the User Menu on the top right corner of the screen.
2. Click the Settings button.
3. Select Email Settings under Configuration.
4. Click the Edit icon on the Customer Portal setting page.
5. Scroll down to the Required Opt-in for Email Delivery section.
6. Enable the checkbox for Allow sending workflow emails to contacts that have opted-out.
7. Click Save.