Emailing lawyers who are using Gmail is not secure, so there’s no need to use Gmail. There are plenty of other options available. The safest option is private email providers such as ProtonMail or Zoho Mail. These do all the work for you and have built-in security features that allow you to protect your emails with end-to-end encryption while still allowing them to be read by others (and also by Google). They can be configured to send an email notification when they receive new mail, which will prevent it from being flagged as spam before you even get a chance to look at it!
How can I best prepare myself for my legal career?