Your org can have an unlimited number of unverified emails, but only one can be verified at a time. Verifying a new email address replaces and deletes the previously verified one, and is the only way to remove a verified email address. This ensures that after setting up your first email address, your org will always have a verified email on file.
Organization-Wide Email Addresses
Considerations for Using Organization-Wide Email Addresses
Troubleshoot Delivery Problems for Salesforce Emails
Verify Email Addresses to Send Email Through Salesforce
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