Hi! and welcome... well, I think it's possible using some "macro", and an external command-line application that sends SMS. But my answer is for HFS Server, not a MikroTik server. I don't know anything about MikroTik. This forum is mainly to discuss about HFS. You should ask this question on a
MikroTik support forum.
http://forum.mikrotik.com/
http://www.mikrotik.com/support.html
P.S.: I don't understand the part where you wrote "to user that your package going to". Are you using HFS on a MikroTik router? We need more information in that case, and please explain in another words "when" you want to send a SMS. Is when some user uploads a file on your HFS server?...