Configuration for Sending UM Mails?

Hi Everybody!

I want to know what are steps and configuration required in Portal so that if a User is created or deleted, then a mail is sent to the user with his initial password, etc?

I did SMTP configuration in the Mail Notifications Tab in UM Configuration & the E-mail Channel in content management but it is not working...

Also is it that i have configure the Mail Transport & make a system on com.sap.netweaver.coll.appl.gw.Lotus_Server also for mails??

Can anybody help me urgently in this...

Regards

Gaurav Gandhi