On 10/22/2013 03:08 PM, Joaquin Moyares Rojas wrote:

greetings list, I have installed the webmail roundube on they debian squeeze, but he/she is giving me error when connecting it with the smtp in another servant of the local net he/she always gives me user's error and countersign, without envargo in that same servant the squirelmail is installed and it is connected well to the external smtp

Enable smtp_debug in Roundcube and provide the log.