Sending mail in localhost:25 with Ssmtp

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http://serverfault.com – I already have Ssmtp installed and working in a Centos 5.7 machine with Gmail configured. I can send mails in th shell without problems. Now i want to use the ssmtp to allow a web app (installed in the same machine) to send mails but for do this i have to find a way to ssmtp "hears" in the port 25 (or any other). There is a way to do this? There is another simple alternative to ssmtp who allows to send mail using localhost:25? Thanks. (HowTos)