Hi Darshan,
Welcome to the community,
You can change the email from the old one to the new one. You need access to the account to change the email or you need to have both domains claimed under the same Atlassian Organization, where the admins would be able to bulk change the emails. This would work if you didn't log in using your new email, otherwise you'd have an account created under the new email and would be unable to change the email to.
If that's not possible, the only workaround would be:
Do you still have access to your previous Trello account? Logged on your phone or browser? If you do, you can log in and invite a new account (you have to create an account with your correct email) as admin of the boards.
In case you don't have the account logged. You can try to log in by getting the correct email and password. - For security reasons, we don't have the tools to change the email address on behalf of the user. So sorry for that, but it is for your safety.
I'm hoping that you can log in. Let me know how it goes, we have some steps to take after inviting your new account.
I will let you some articles, that will help you invite the new email. You can choose one way to go.
* https://support.atlassian.com/trello/docs/how-to-transfer-boards-to-a-new-account/
* https://support.atlassian.com/trello/docs/inviting-people-to-a-workspace/
* https://support.atlassian.com/trello/docs/adding-people-to-a-board/
I hate to be the bearer of this news, but if you don't have the account logged the only way to regain access to it would be to restore the mailbox to reset the password and regain access. You could reach your email admin and ask then to make your old email an alias for your new one, this will guarantee you receive emails send to your old address on your current mailbox being able to reset your password.
I hope this helps, have a good day.
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