Service SMTP IP address

We have received from our server logwatch report we found lot of ip address are using our SMTP service, is it normal. How can we block the IP address to use our server SMTP.

Thanks
Kanagaraj


Connections:
Service ftp:
*.132.251.53: 4 Time(s)
*.225.98.119: 4 Time(s)
Service smtp:
*.233.98.127: 1 Time(s)
*.47.198.167: 1 Time(s)
*.119.243.150: 1 Time(s)
*.177.113.83: 1 Time(s)
*.1.50.122: 2 Time(s)
*.1.50.246: 2 Time(s)
*.11.43.47: 1 Time(s)
*.11.45.148: 2 Time(s)
*.95.205.98: 1 Time(s)
*.248.225.71: 1 Time(s)
*.249.63.116: 2 Time(s)
*.175.103.218: 1 Time(s)
*.248.90.152: 2 Time(s)
*.4.16.71: 1 Time(s)
*.14.48.145: 4 Time(s)
*.27.26.109: 2 Time(s)
*.73.195.88: 1 Time(s)
*.183.70.92: 1 Time(s)
*.183.75.216: 1 Time(s)
*.248.150.226: 2 Time(s)
*.65.62.73: 1 Time(s)
*.86.148.245: 1 Time(s)
*.131.149.124: 1 Time(s)
*.77.127.114: 1 Time(s)
*.79.173.193: 1 Time(s)
*.125.137.252: 1 Time(s)
*.147.192.244: 1 Time(s)
*.189.63.62: 1 Time(s)
*.194.246.192: 1 Time(s)
*.192.21.230: 1 Time(s)
*.193.23.29: 3 Time(s)
*.194.129.148: 1 Time(s)
*.202.97.12: 1 Time(s)
*.34.194.162: 1 Time(s)
*.224.205.68: 1 Time(s)
*.152.252.154: 1 Time(s)
*.153.173.180: 2 Time(s)
*.193.23.117: 1 Time(s)
*.207.91.153: 1 Time(s)
*.9.34.97: 1 Time(s) ........

Many more...

 

 

 

 

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