[root@myhost ~]# telnet 149.XXX.XXX.161 25
Trying 149.XXX.XXX.161...

console> tcpdump 'host 149.XXX.XXX.161 and port 25'
tcpdump: Starting Packet Dump
10:44:31.463299 Port5, OUT: IP 192.168.9.101.49108 > 149.XXX.XXX.161.25: Flags [S], seq 1443620852, win 29200, options [mss 1460,sackOK,TS val 42767219 ecr 0,nop,wscale 7], length 0
10:44:32.484692 Port1, IN: IP 192.168.9.101.49108 > 149.XXX.XXX.161.25: Flags [S], seq 1443620852, win 29200, options [mss 1460,sackOK,TS val 42768241 ecr 0,nop,wscale 7], length 0
10:44:32.484709 Port5, OUT: IP 192.168.9.101.49108 > 149.XXX.XXX.161.25: Flags [S], seq 1443620852, win 29200, options [mss 1460,sackOK,TS val 42768241 ecr 0,nop,wscale 7], length 0
10:44:34.490869 Port1, IN: IP 192.168.9.101.49108 > 149.XXX.XXX.161.25: Flags [S], seq 1443620852, win 29200, options [mss 1460,sackOK,TS val 42770248 ecr 0,nop,wscale 7], length 0
10:44:34.490886 Port5, OUT: IP 192.168.9.101.49108 > 149.XXX.XXX.161.25: Flags [S], seq 1443620852, win 29200, options [mss 1460,sackOK,TS val 42770248 ecr 0,nop,wscale 7], length 0
10:44:38.498842 Port1, IN: IP 192.168.9.101.49108 > 149.XXX.XXX.161.25: Flags [S], seq 1443620852, win 29200, options [mss 1460,sackOK,TS val 42774256 ecr 0,nop,wscale 7], length 0
10:44:38.498859 Port5, OUT: IP 192.168.9.101.49108 > 149.XXX.XXX.161.25: Flags [S], seq 1443620852, win 29200, options [mss 1460,sackOK,TS val 42774256 ecr 0,nop,wscale 7], length 0
10:44:46.515029 Port1, IN: IP 192.168.9.101.49108 > 149.XXX.XXX.161.25: Flags [S], seq 1443620852, win 29200, options [mss 1460,sackOK,TS val 42782272 ecr 0,nop,wscale 7], length 0
10:44:46.515048 Port5, OUT: IP 192.168.9.101.49108 > 149.XXX.XXX.161.25: Flags [S], seq 1443620852, win 29200, options [mss 1460,sackOK,TS val 42782272 ecr 0,nop,wscale 7], length 0
10:45:02.546865 Port1, IN: IP 192.168.9.101.49108 > 149.XXX.XXX.161.25: Flags [S], seq 1443620852, win 29200, options [mss 1460,sackOK,TS val 42798304 ecr 0,nop,wscale 7], length 0
10:45:02.546882 Port5, OUT: IP 192.168.9.101.49108 > 149.XXX.XXX.161.25: Flags [S], seq 1443620852, win 29200, options [mss 1460,sackOK,TS val 42798304 ecr 0,nop,wscale 7], length 0