SMTP Error 250 when sending a message

[®om]

I have a problem with my SMTP in roundcube.

During the roundcube installation process, in /installer/?_step=3, I can "send test mail" without problem, I put my user, my password, my mail as sender and my mail as recipient, and it works.

in roundcube (once installed), when I want to send a real message, I have SMTP Error 250, and this error in syslog :

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Aug 30 11:34:16 rom-eeebox roundcube: [30-Aug-2009 11:34:16 +0200]: SMTP Error: SMTP error: Authentication failure: SMTP server does not support authentication (Code: ) in /home/rom/mail/program/steps/mail/func.inc on line 1336 (POST /?_task=mail&_action=send)

"SMTP server does not support authentication" : that is just stupid, it worked in step 3, it works in my mail client, it works in mutt... so obviously it supports authentication...

I really don't understand why it doesn't work when I want to send a message with roundcube.

Please help.

Thank you...

[®om]

I found, I removed the user/pass :

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$rcmail_config['smtp_user'] = '';
$rcmail_config['smtp_pass'] = '';

and it works (that's maybe because on localhost there is no need to authenticate).