Thank you for getting in touch with us.
Currently, we don't support the ability to modify email addresses once they've reached us. My recommendation would be to submit this feature request in our feature request forum, once it gathers enough upvotes from the community, we will be looking to prioritise it as part of our product roadmap. And as a bonus, if you've created or up-voted a feature request, you will receive a notification from us, as soon as the feature becomes available within Raygun.
Let us know if you have any other questions!