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Some emails I send (from php) are returned by hotmail with this message:

User and password not set, continuing without authentication. does not like recipient.
Remote host said: 550 Requested action not taken: mailbox unavailable
Giving up on

I understand that the recipient has no mailbox. But what does that mean:

"User and password not set, continuing without authentication."

And what can I do to avoid it?

I use linux/qmail.

EDIT : I am not using hotmail to send emails. I am sending emails to some hotmail users.

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The e-mails doenst exist.

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You qmail servers SMTP route specification file does not contain a username/password line for You probably misconfigured SMTP AUTH with your relay host.

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Actually I am not using hotmail. I am sending emails to some hotmail users. Hotmail is the only one displaying such a message. – Toto Sep 28 '09 at 14:18

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