Hi, The 64Bit How to is the same for 32bit. However there are small changes which are incorporated in the instructions of the 64bit install. Read howto carefully and you will see instructions for 32Bit.
You can use the 64bit tutorial. The only difference is on http://www.howtoforge.com/perfect_setup_fedora_core_5_p5 . Where it says Code: vi /usr/lib64/sasl2/smtpd.conf you run Code: vi /usr/lib/sasl2/smtpd.conf instead.