Can I find and use free IPv4 IP addresses on my SMTP server for email marketing?

For example Can I just find other people's IP addresed and use their addresses on my SMTP server? like on my website I see all my visitor's IP addresses, can I use those IP addresses on my SMTP server?

or can i find free IPv4 addresses that was never used by anyone before?

Possible via botnet but its illegal. Better you don't go in that path.

Cheers

visitor123 said:

like on my website I see all my visitor's IP addresses, can I use those IP addresses on my SMTP server?

Click to expand...

No.