I'd like to share with you this piece of my log file. I'm doing something wrong with mail_user_add function. Because it give me 3 errors Code: 2013/05/25 11:08:54 [trace] [ispconfigsoap] updateMailConfig - Cliente #62: [email protected][email protected][email protected][email protected] I know it's strange to create mailbox with this kind of username, but it's necessary for our internal needs, and please keep in mind that when I tried to modify mail_user_add.php into examples dir of installation file and run it with php -f mail_user_add.php using the same parameters everything worked Code: root@vldidevhost1:~/ispconfig3_install/remoting_client/examples# php -f mail_user_add.php Logged successfull. Session ID:0f046f41dba366a39bf6ad79a1458e12 New user: 13 Logged out.<br /> The same code, with same parameters created a new user with is 13, but when it run from my code it give me 100% of times the error pasted at the top. Why ? What could be the problem ? Why the same api with the same parameters do different things ?!