With tcpdump port ssmtp -vvv -x I got:
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 12:43:43.533417 IP (tos 0x0, ttl 55, id 26600, offset 0, flags [DF], length: 60) p548D902D.dip0.t-ipconnect.de.46633 > azimuth.alternativ.net.ssmtp: S [tcp sum ok] 2675929853:2675929853(0) win 5840 <mss 1452,sackOK,timestamp 17044757 0,nop,wscale 2> 0x0000: 4500 003c 67e8 4000 3706 79f2 548d 902d E..<[EMAIL PROTECTED] 0x0010: d592 a794 b629 01d1 9f7f 72fd 0000 0000 .....)....r..... 0x0020: a002 16d0 eeca 0000 0204 05ac 0402 080a ................ 0x0030: 0104 1515 0000 0000 0103 0302 ............ 12:43:43.533486 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], length: 40) azimuth.alternativ.net.ssmtp > p548D902D.dip0.t-ipconnect.de.46633: R [tcp sum ok] 0:0(0) ack 2675929854 win 0 0x0000: 4500 0028 0000 4000 4006 d8ee d592 a794 E..([EMAIL PROTECTED]@....... 0x0010: 548d 902d 01d1 b629 0000 0000 9f7f 72fe T..-...)......r. 0x0020: 5014 0000 8376 0000 P....v.. 12:43:43.584503 IP (tos 0x0, ttl 55, id 1345, offset 0, flags [DF], length: 60) p548D902D.dip0.t-ipconnect.de.46634 > azimuth.alternativ.net.ssmtp: S [tcp sum ok] 2665680902:2665680902(0) win 5840 <mss 1452,sackOK,timestamp 17044807 0,nop,wscale 2> 0x0000: 4500 003c 0541 4000 3706 dc99 548d 902d E..<[EMAIL PROTECTED] 0x0010: d592 a794 b62a 01d1 9ee3 1006 0000 0000 .....*.......... 0x0020: a002 16d0 522b 0000 0204 05ac 0402 080a ....R +.......... 0x0030: 0104 1547 0000 0000 0103 0302 ...G........ 12:43:43.584576 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], length: 40) azimuth.alternativ.net.ssmtp > p548D902D.dip0.t-ipconnect.de.46634: R [tcp sum ok] 0:0(0) ack 2665680903 win 0 0x0000: 4500 0028 0000 4000 4006 d8ee d592 a794 E..([EMAIL PROTECTED]@....... 0x0010: 548d 902d 01d1 b62a 0000 0000 9ee3 1007 T..-...*........ 0x0020: 5014 0000 e708 0000 P....... -- http://www.alternativ.net/~vinci Jabber: [EMAIL PROTECTED] -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]