go
mail.ctsi.com.br, ey-in-f83.1e100.net and mail.apoiotatico.com.br point to 74.125.79.83.

ey-in-f83.1e100.net
a records
 
+ 74.125.79.83 74.125.78.0/23 AS15169 -
+ --- -

mail.apoiotatico.com.br
cname records
gmail.com
+ 74.125.79.83 74.125.78.0/23 AS15169 ey-in-f83.1e100.net
+ --- ey-in-f83.1e100.net

mail.ctsi.com.br
cname records
gmail.com
+ 74.125.79.83 74.125.78.0/23 AS15169 ey-in-f83.1e100.net
+ --- ey-in-f83.1e100.net
ip numbers of host
74.125.79.83
ptrs of ip numbers
ey-in-f83.1e100.net
hostnames sharing ip with a-records
ey-in-f83.1e100.net
mail.apoiotatico.com.br
mail.ctsi.com.br
domains using this as mailserver
apoiotatico.com.br