logwatch - sendmail unknow users

I've been getting a lot of these unknown local users entry under sendmail section in my logwatch report

Unknown local users:

alex@somedomain.com
from friend@friend.net [xxx.xxx.xxx.xxx] 2 time(s).

alice@somedomain.com
from friend@friend.net [xxx.xxx.xxx.xxx] 2 time(s).

bill@somedomain.com
from friend@friend.net [xxx.xxx.xxx.xxx] 2 time(s).

brenda@somedomain.com
from friend@friend.net[xxx.xxx.xxx.xxx] 2 time(s).

brian@somedomain.com
from friend@friend.net [xxx.xxx.xxx.xxx] 1 time(s).

Where
friend@friend.net IP:xxx.xxx.xxx.xxx is my friend's ip address and isp hostname. I am hosting his domain (somedomain.com) on my vps. Does this mean his home pc is infected by some spam bots?

 

 

 

 

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