Hello @steve.bolam,
Thank you for reaching out to LastPass support, my name is Hilda and I will be assisting you with the issue you're experiencing.All emails store in your vault as usernames in your items, will automatically be monitored, you can go to the security dashboard and scroll down the list of email to look for the desire one
If assistance is still needed, let me know, I will be glad to continue working with you.
Have a wonderful day and take care!
Hilda
The LastPass Support Team
Please visit our support center at https://support.lastpass.com to access our knowledge base or to contact our Customer Care team.