Fix bug logging multiple IPs to email body

[TheZenTester]

Updating external_test function to only send 1 IP address in the message body. Currently, as written, if there is a targets list of multiple IP addresses, and a successful e-mail is sent, it will append all IP addresses/server names attempted in the for loop to that point.

Also added a few newline returns to print the vulnerable server IP on a completely separate line