Send custom E-mail using sharepoint services
I am new to sharepoint. I am trying to write a webpart by which users will be able to send custom e-mails through sharepoint. Is there any standard service or any class that I can use to send the e-mail. Also when a user is added to sharepoint, sharepoint validates the user from active directory and also fetches the e-mail id. Is there any similar APIs available to do the validation?
Any help will be appreciated.
Thanks and Regards,