The Client does not have permission to Send As this sender

G

Guest

Hello
I use Outlook 2003. For a while, one of my pop3 account tries to send 2 items that gives me an error message. I can send e-mail via this account but these items (that i don' t know what they are)
Error message: 0X000800421B, The operation timed out waiting for response from the sending (SMTP) server. The server responded 454 5.7.3 Client does not have permission to Send As this sender

Thank you.
 

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