Changing an Email Address
The email address associated with your Trello account, also referred to as an account credential, can be used to log in to Trello, recover an account when the password has been forgotten, receive Trello notifications, or as a way for other Trello members to be able to add you to their boards for collaborating on a project. You may have one email address per account and you will use this single email address to log into Trello and recover your account if your password has been forgotten.
Using Trello with an Atlassian Account
If you’re using Trello with an Atlassian account, your account's email address will need to be changed from inside of the Atlassian account. This will also change the email address that you use to log into other Atlassian products: Changing Atlassian account email.
Changing an email address in Trello
To change the email address you use to log into Trello, go to your account settings page at http://trello.com/my/profile and click on Profile & Visibility. Then select Change email address from the Contact section.
A confirmation email will be sent to the new email address. After clicking the link in the email to confirm the change, you’ll need to log in again with your previous email address.
Then, you’ll see your Profile & Visibility page is now updated with the new email address and your previous email address is removed from the account.
If you currently have more than one email addresses on your account, you must remove your additional email addresses in order to change to a new email address.
Please note: It is not possible to change an email credential to an email address that is already in use with another Trello account.
Using a company email address on your Trello account
Many people use Trello for personal life and to collaborate with teams at work. We recommend to keep your personal and work content in separate Trello accounts.
If your account is only used for personal reasons or you no longer work at the organization, use a personal email address. By removing the company email address and using only a personal email, your Trello account will remain a personal account.
If you're using a company email address on your Trello account, and the organization who owns the domain (everything after the @ in your email address) has verified the domain on their Atlassian Organization, the Organization Admin have the ability to manage your Trello account. This means they could deactivate or delete the Trello account at any time.
For information on merging Trello accounts, please see this article.