mail.eyefind.info, also known as EyeFind Mail, is an e-mail service offered by eyefind.info in Grand Theft Auto IV and Episodes of Liberty City that Niko Bellic, Johnny Klebitz and Luis Lopez can all access from any computer in the game.
The e-mails can be from friends, Niko's mother, they can start missions, or they can just be random spam. Some e-mails are a means of communication, to add detail to important parts of the storyline. The player can reply positively or negatively to e-mails from other characters, but only has the delete option for spam.
Spam e-mails generally contain useless or explicit information. Some however will link to other fictional in-game websites or may refer to places in Liberty City.