Yes. Just connect using the Virtual Name.

Before I begin, you are using DBMail not DBAMail. Now that has been addressed here are the answers to you questions.

1) eMail address is the address from where...

SQL Server does store the virutal server IP at it's in the registry. Its been months since I changed our cluster IP so I don't remember where. However,...

No. Partitioning is only in the enterprise edition.

I have already brought this to MS's attention. I was told it was an oversight and will be fixed in SP2.