Hello, <BR>in a site I registers users and then I sen&#039;t them an e-mail with his login and password.<BR>When I try to register 2 users at the same time then it returns me the next error:<BR><BR>Persist.MailSender 4. Error &#039;800a0006&#039; 550 5.7.1<BR>mailto:rafael.flores@barcelona-on-line.es Relaying denied<BR>IP name lookup failed [] , respuesta line 115<BR><BR>In the ASP page where I do it I lock and unlock the application.<BR>I think the problem is generated by the email but it doesn&#039;t upfate the registers in the database too.<BR><BR>Please Help me.<BR>Kind regards.<BR>