251 User not local; will forward

When an SMTP mail server responds to a mail message with:

251 User not local; will forward
This indicates that the email address has changed to a new one, and that the SMTP server will forward the message to the correct address.

Node that if a 251 User not local response is received, you do not need to update your email address book; you can continue to use this address and do not need to inform the user of the forwarding.

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