Typical SMTP PDU Traces
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Typical SMTP PDU Traces
IP_PDU MailServer UA DATA TCP IP subtotal
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1 TCP .<------- TCP SYN -------- . 0 24 44
2 TCP . ------- TCP SYN ack ---->. 0 24 44
3 TCP .<------- Push ACK ------- . 0 20 40 (128)
4 SMTP . ----220 server ready --->. 116 136 156
5 TCP .<------- Push ACK ------- . 0 20 40 (196)
6 SMTP .<------- HELO <client>--- . 36 56 76
7 SMTP . ----250 server Hello --->. 111 131 151
8 TCP .<------- Push ACK ------- . 0 20 40 (267)
9 SMTP .<--MAIL FROM:<sender> --- . 32 52 72
10 SMTP . ----250 ... Sender ok--->. 39 59 79
11 TCP .<------- Push ACK ------- . 0 20 40 (191)
12 SMTP .<--RCPT TO:<rcpt>-------- . 33 53 73
13 SMTP .<----250...Recipient ok-- . 45 65 85
14 TCP .<------- Push ACK ------- . 0 20 40 (198)