Most likely, yes. Most loan officers register using their work email address that is often linked directly to their employer/lending company. If you've changed to another lender, you likely won't have access to that email address any longer. You'll need to update your primary address. If you don't, you may lose the ability to reset your password, receive receipts for payment on your account, and other important tasks. 

See this helpful article for information on changing your primary email address

You may also need to update your company information in your profile. This is accessed by navigating to Settings (gear icon) > Profile & Lender.