Fail2Ban automatic or something to do with SASL attack

Virtualmin
11

This is what I see on my system:

Status for the jail: postfix-sasl
|- Filter
|  |- Currently failed:	7
|  |- Total failed:	73
|  `- Journal matches:	_SYSTEMD_UNIT=postfix.service
`- Actions
   |- Currently banned:	23
   |- Total banned:	37
   `- Banned IP list:	46.38.145.251 46.38.145.250 46.38.145.253 46.38.145.252 185.143.73.84 185.143.73.157 185.143.73.171 185.143.73.152 185.143.73.175 185.143.73.134 185.143.73.48 185.143.73.41 185.143.73.62 46.38.145.247 185.143.73.103 185.143.73.93 185.143.73.148 185.143.73.250 185.143.73.142 212.70.149.19 185.143.73.33 185.143.73.58 185.143.73.162