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This article explains why you cannot remove an email address from Sender profiles even when no enabled notifications use it, and how to change or remove it.
Sender profiles define the "From Address" used in email notifications. You can have multiple From Addresses; each notification can use a different one.
To remove an address
If you cannot delete it, the address is used by another email notification or the Master template.
Note:
The Master template's Sender profile is used for OTP emails sent to customers for the Self-serve portal. To change this address, follow the steps above.
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