STMP configuration parameter is/SMTP/virt_host

Hello

I have a problem I am following the STMP configuration guide (http://help.sap.com/saphelp_nw04/helpdata/en/af/73563c1e734f0fe10000000a114084/frameset.htm)

But in the step Assigning the Client (Transaction SICF) --> Host data I put the parameter 0 and the Data configuration information never change of this value ( :) . I have configurated in other system and inthis steps this value was change automatically to ( *:25000) before I put the parameter 0

Any idea, suggestionn for reason this problem

thanks Danny