Hi Paul!
As you're using Trello with an Atlassian account, you can change your email address from your Atlassian account profile. To do that, login to sales@xyz.com then visit https://id.atlassian.com/manage-profile/email and enter your new email address (e.g. sales@abc.com).
We'll send you an email with a link to confirm your address. Follow that link from the email, and log into your account with your previous email once more. Then, you will see your new email address is updated on your profile page.
I hope this helps, but let us know if you have any questions!
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