S: MAIL FROM: <smith@alpha> R: 250 OK S: MAIL FROM: <Jones@beta> R: 250 OK S: MAIL FROM: <green@beta> R: 250 OK S: MAIL FROM: <brown@beta> R: 250 OK S: DATA R: 354 Start mail input, end with <CRLF>.<CRLF> S: blah, blah, blah.. S: ... etc ... S: <CRLF>.<CRLF> R: 250 OK