Try SMTP interaction for yourself:
{"Image DocumentName": "Try SMTP interaction for yourself:", "Image ImageDescription": "telnet servername 25. see 220 reply from server. enter HELO, MAIL FROM, RCPT TO, DATA, QUIT commands. above lets you send  without using  client (reader) 2: Application Layer.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}