This is an error message that is generated by the SMTP server. The reason for why this error is generated and returned is that the client is trying to send the recipient (RCPT TO) command before the mail (MAIL FROM) command. This behavior is usually not allowed. In other words, the client (in this case eZ publish using the PHP mail functions) is not communicating with the mail server according to the SMTP standard/specifications. It might be caused by a missing admin/from-mail setting. Please check that your override configuration file for site.ini (/settings/override/site.ini.append.php) contains the following:
Another thing: please try to avoid using the form/process functionality. Use the information collection feature instead. It is more reliable/secure. The form/process feature is going to be deprecated / removed.
Balazs
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