I don't have a Gmail account but I need the email search features of Simple CRM. How do we do that?

To benefit from the best email features of Simple CRM, I recommend you create a GMail email account (Google).

Once you have created your Google Account:

configure your email software to always send a copy of outgoing emails to your Gmail address

configure your GMail account to import automatically into it the emails received on your usual mailbox, you will find the details here: https://support.google.com/mail/answer/56283?hl=en (option n°3).

This configuration will allow you to search, from Simple CRM, the emails exchanged with a contact, directly in your GMail mailbox.