Hello, some spammer is using *.* as Helo command. I can not block that, because if I use HELO filter and block HELO *.*, all connections are blocked, any idea?

65.182.89.4 [0DD0] 05:46:09 <<< HELO *.*
65.182.89.4 [0F3C] 05:50:24 <<< HELO *.*
200.35.185.180 [0EC8] 05:54:41 <<< HELO *.*
65.182.89.4 [0EC8] 05:58:51 <<< HELO *.*
181.211.10.202 [0EC8] 06:11:36 <<< HELO *.*
84.241.1.21 [0EC8] 06:24:23 <<< HELO *.*
190.216.165.6 [0EC8] 06:32:40 <<< HELO *.*
185.109.169.71 [0EC8] 06:36:54 <<< HELO *.*
31.28.86.59 [0EC8] 06:41:10 <<< HELO *.*
181.49.39.70 [0EC8] 06:49:41 <<< HELO *.*
200.35.185.180 [0EC8] 07:02:18 <<< HELO *.*