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Tag Archives: 550 5.7.1
Exchange 2003 – SMTP error 550 5.7.1 Unable to relay for user@domain.com
One of my customer got this error after adding a new SMTP domain to mailboxes. In his case he add the email address directly from the AD to some mailboxes and then got this error when trying to send them … Continue reading
Posted in Exchange 2003, Microsoft Exchange
Tagged 2003, 550 5.7.1, Exchange, relay, unable to relay
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