imapd attack to my server

Hello,

I have tons of imapd processes when I do ps -aux

And in /var/log/mailog every second I get:

imapd[10526]: Autologout user=??? domain=??? host=[random_ip_here]
imapd[11049]: Autologout user=??? domain=??? host=[random_ip_here]

and so on...

Is there anything I could do to prevent this attack?

Thanks

 

 

 

 

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