Help me please if you can ?????????

[mammado]

I am working in a project and faced me aproblem so i need your help (anyone) please ........
I need to send different messa
I want to make in my website that anyone after registeration can send a message ta aspecific department (which contain of many persons) and the message in the first sending from anyonego to the first person in the department and when another one send another message then it is go to the second person in the department and when other send another message then it is send to the third in department ......
Note
-The names of the persons how received messages is in my database(SQL).
-The names of the persons how send messages is in my database(SQL).
If any one read my message and need to help me and need some information please ask me .................................................thanks for your time