There are several signals emitted during authentication flows. You can hook to them for your own needs.
Sent when a user logs in.
Sent when a user signs up for an account. This signal is typically followed by a user_logged_in, unless e-mail verification prohibits the user to log in.
Sent when a password has been successfully set for the first time.
Sent when a password has been successfully changed.
Sent when a password has been successfully reset.
Sent after the email address in the db was updated and set to confirmed.
Sent right after the email confirmation is sent.
allauth.account.signals.email_changed(request, user, from_email_address, to_email_address)
Sent when a primary email address has been changed.
allauth.account.signals.email_added(request, user, email_address)
Sent when a new email address has been added.
allauth.account.signals.email_removed(request, user, email_address)
Sent when an email address has been deleted.