sendmail supported in Code Igniter, but not postfix or exim

[eluser]wonjun[/eluser]
Hi everyone,

I'm a newbie starting out and I'm wondering if anyone has used postfix or exim using CodeIgniter or if that is possible.

I read that we can set up CodeIgniter to use sendmail, but on articles like this, http://shearer.org/MTA_Comparison

sendmail is supposed to be not as good as other two MTAs.

Could you please let me know if I should look into using postfix or exim, if so, where I should I begin?

Thank you!