Dear list,
I was surprised to find this in one of my script's live output : 

Feb 11 16:01:16 [email protected]           104.131.92.159:
Feb 11 16:01:19 [email protected]           81.91.92.176:
Feb 11 16:01:21 [email protected]           213.136.88.68:
Feb 11 16:01:25 [email protected]           132.148.21.197:
Feb 11 16:01:28 [email protected]           91.121.136.82:
Feb 11 16:01:31 [email protected]           70.32.72.249:
Feb 11 16:01:33 [email protected]           88.198.177.200:
Feb 11 16:01:37 [email protected]           132.148.22.72:
Feb 11 16:01:40 [email protected]           185.14.28.209:
Feb 11 16:01:47 [email protected]           185.14.28.209:
Feb 11 16:01:50 [email protected]           31.186.8.165:
Feb 11 16:01:52 [email protected]           176.31.171.249:
Feb 11 16:01:55 [email protected]           174.142.254.4:
Feb 11 16:01:58 [email protected]           173.249.5.133:
Feb 11 16:02:04 [email protected]           103.1.239.204:
Feb 11 16:02:10 [email protected]           115.146.127.53:
Feb 11 16:02:13 [email protected]           80.87.200.146:
Feb 11 16:02:17 [email protected]           50.62.82.236:
Feb 11 16:02:20 [email protected]           158.222.0.202:
Feb 11 16:02:24 [email protected]           89.219.33.110:
Feb 11 16:02:26 [email protected]           37.59.8.29:
Feb 11 16:02:28 [email protected]           85.25.213.84:
Feb 11 16:02:31 [email protected]           185.95.85.159:
Feb 11 16:02:33 [email protected]           146.185.160.102:
Feb 11 16:02:35 [email protected]           94.23.93.101:
Feb 11 16:02:38 [email protected]           104.236.206.7:
Feb 11 16:02:41 [email protected]           194.150.118.6:
Feb 11 16:02:44 [email protected]           212.109.221.24:
Feb 11 16:02:46 [email protected]           146.185.157.149:
Feb 11 16:02:48 [email protected]           62.75.202.128:
Feb 11 16:02:51 [email protected]           193.203.206.3:
Feb 11 16:02:55 [email protected]           208.107.4.149:
Feb 11 16:02:57 [email protected]           173.212.252.117:
Feb 11 16:03:01 [email protected]           38.109.217.143:
Feb 11 16:03:04 [email protected]           5.2.209.70:
Feb 11 16:03:10 [email protected]           101.99.65.25:
Feb 11 16:03:12 [email protected]           91.121.85.220:
Feb 11 16:03:15 [email protected]           83.220.174.125:
Feb 11 16:03:19 [email protected]           173.203.58.135:
Feb 11 16:03:21 [email protected]           144.76.60.149:
Feb 11 16:03:24 [email protected]           37.46.131.252:
Feb 11 16:03:30 [email protected]           221.132.35.142:
Feb 11 16:03:32 [email protected]           46.4.122.252:
Feb 11 16:03:36 [email protected]           64.91.251.84:
Feb 11 16:03:39 [email protected]           94.181.191.195:
Feb 11 16:03:42 [email protected]           216.27.29.7:
Feb 11 16:03:44 [email protected]           176.31.182.14:
Feb 11 16:03:48 [email protected]           47.22.0.41:
Feb 11 16:03:50 [email protected]           188.166.112.173:
Feb 11 16:03:53 [email protected]           62.109.23.50:
Feb 11 16:03:59 [email protected]           210.211.118.171:
Feb 11 16:04:02 [email protected]           176.57.209.53:
Feb 11 16:04:04 [email protected]           37.97.198.103:
Feb 11 16:04:10 [email protected]           221.132.35.142:
Feb 11 16:04:16 [email protected]           163.44.206.185:
Feb 11 16:04:19 [email protected]           184.173.181.142:
Feb 11 16:04:24 [email protected]           198.12.149.197:
Feb 11 16:04:27 [email protected]           213.159.208.254:
Feb 11 16:04:30 [email protected]           198.50.145.221:
Feb 11 16:04:36 [email protected]           190.13.128.146:
Feb 11 16:04:41 [email protected]           139.196.229.151:
Feb 11 16:04:43 [email protected]           176.9.122.132:

It was generated in realtime by ychaouche/mailcop


  
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ychaouche/mailcop
 mailcop - Watches your mail server  |   |

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As you can see there are multiple IPs involved, it seems to be some kind of 
distributed attack. Is there any way I can protect my server against this ?
Yassine.



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