it's my plasure to mail you. it's my pleasure to e-mail you. it's my pleasure to send you an e-mail. or it's my pleasure to mail your+ what you want to mail e.g. it's my pleasure to mail your CV to the company.

This sounds like the beginning of a formal invitation. Often wedding invitations begin with: Mr and Mrs Smith and Mr and Mrs Brown have the please of inviting you to John and Jane's wedding which will be held on 16 July 2012 at the Basillica and afterwards at Capri Receptions. Please RSVP by 15June 2012 to the above email address or phone number.

Nope. It's nonsense.

It is my pleasure to send you email.

Sorry, it is incomplete and doesn't make sense !