I am working on an app that has some trivial email functions. Here are the code examples I am looking for, they did not turn up in this forum or on other searches

1) Email verification: [email protected] is the email address of some user. Is there a way to query the mail server at cbd.net to see if the email does indeed exists and can recieve?

2) Sending Email: Is there a method/code for sending email from that particular IP to the recipient. Example: luser is running my app on his 56K ISP dialup connect. He has the ip 123.456.678.901 when connected. I want him to be able to type in the email address in the text box, a message in a larger text box, and when he clicks send the recipient get the mail from 123.456.678.901 and NOT thought luser's ISP mail server.

Thanks