Does Changing the Domain Change Your Email Address?
Changing the part after @ creates a different full address and therefore a different address identity.
Quick answer
Changing the part after @ creates a different full address and therefore a different address identity.
The domain is part of the full address
The full email address contains both the local part before @ and the domain after @. Changing the domain therefore produces a different full address even if the name before @ stays similar.
A website decides whether it will accept an address in its own form. Mail delivery begins only after a sender actually sends a message to that address, so the two outcomes should not be treated as the same test.
Separate website policy from mail delivery
MailOnce can provide another available domain when the product supports multiple domains, but that is an alternative address choice rather than a promise to defeat a website rule. If a service requires a stable or non-disposable address, respect that requirement.
Changing the part after @ creates a different full address and therefore a different address identity.
What changes when the domain changes
Diagnose the layer first: website acceptance, address choice and message delivery are related, but they are not interchangeable. Changing the part after @ creates a different full address and therefore a different address identity.
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