| Front | Mail: SMTP |
|---|---|
| Back | Simple Mail Transfer Protocol TCP: Port 25 Push protocol: Sender initiates connection - Direct transfer from the source server to the target server - ASCII commands and responses - All messages must be in 7-bit ASCII -> Problems for attachments, transcoding - Persistent connection, several messages can be transmitted in one session - Multiple objects (text, images) can be transferred in a message |
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